<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2024 Workiva-->
<!--r:d65745ab-3d4e-455c-8ab3-fca6fd0c5ef7,g:320a544f-964e-47a6-acd4-0c8d5f01e8ec-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://hydrafacial.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYDEFICIT" xlink:type="simple" xlink:href="skin-20240331.xsd#CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYDEFICIT"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/CONSOLIDATEDSTATEMENTSOFSTOCKHOLDERSEQUITYDEFICIT" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_8cedc91c-9d98-48fe-a8bc-b47876c18b0c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_0f183c7e-7303-4d35-b314-01e9fb698ffd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_8cedc91c-9d98-48fe-a8bc-b47876c18b0c" xlink:to="loc_us-gaap_StatementTable_0f183c7e-7303-4d35-b314-01e9fb698ffd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_2cd62c1e-3854-4d75-a3d1-f715640757f5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_0f183c7e-7303-4d35-b314-01e9fb698ffd" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_2cd62c1e-3854-4d75-a3d1-f715640757f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_2cd62c1e-3854-4d75-a3d1-f715640757f5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_2cd62c1e-3854-4d75-a3d1-f715640757f5" xlink:to="loc_us-gaap_EquityComponentDomain_2cd62c1e-3854-4d75-a3d1-f715640757f5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f0357b1e-eda3-42bd-9ef2-5693767101f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_2cd62c1e-3854-4d75-a3d1-f715640757f5" xlink:to="loc_us-gaap_EquityComponentDomain_f0357b1e-eda3-42bd-9ef2-5693767101f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_983a3c40-a140-4072-be09-03b2ed5517dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f0357b1e-eda3-42bd-9ef2-5693767101f9" xlink:to="loc_us-gaap_CommonStockMember_983a3c40-a140-4072-be09-03b2ed5517dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_55dc9e82-47a6-4c74-b4ce-7736e269a2c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f0357b1e-eda3-42bd-9ef2-5693767101f9" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_55dc9e82-47a6-4c74-b4ce-7736e269a2c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_d1d0632c-d498-4be1-9eb3-3f1cfa76b304" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f0357b1e-eda3-42bd-9ef2-5693767101f9" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_d1d0632c-d498-4be1-9eb3-3f1cfa76b304" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_03b28d4c-62a6-4cfc-8ef3-4db4e6e07a80" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_f0357b1e-eda3-42bd-9ef2-5693767101f9" xlink:to="loc_us-gaap_RetainedEarningsMember_03b28d4c-62a6-4cfc-8ef3-4db4e6e07a80" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_8cedc91c-9d98-48fe-a8bc-b47876c18b0c" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_5ba00802-4ba2-4b09-b051-e8c860f1dcae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_5ba00802-4ba2-4b09-b051-e8c860f1dcae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_6e2d121e-c77a-46dc-99a3-ac090da5bdd9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:to="loc_us-gaap_StockholdersEquity_6e2d121e-c77a-46dc-99a3-ac090da5bdd9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_1655733f-ed24-46d9-8041-1afc97dd37d7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:to="loc_us-gaap_NetIncomeLoss_1655733f-ed24-46d9-8041-1afc97dd37d7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_a2a992b8-bdfc-459e-8ca2-07e8384a90b7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_a2a992b8-bdfc-459e-8ca2-07e8384a90b7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_5b6528a4-48b3-4681-94ba-a79b918d52dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:to="loc_us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation_5b6528a4-48b3-4681-94ba-a79b918d52dd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_d7e46ada-36db-454b-b9a0-466c1fc90496" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:to="loc_us-gaap_AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation_d7e46ada-36db-454b-b9a0-466c1fc90496" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_1d44a829-6f27-4ecb-bda4-2438eb7f0a5a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_1d44a829-6f27-4ecb-bda4-2438eb7f0a5a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_02359227-76a1-446f-998f-7f0358965666" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_02359227-76a1-446f-998f-7f0358965666" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_89f2f1ce-1070-4905-8945-6031a4346e4b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_89f2f1ce-1070-4905-8945-6031a4346e4b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_b56b95af-d3e4-411c-a834-a535b06d7e7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_b56b95af-d3e4-411c-a834-a535b06d7e7a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_deee2fed-c43f-4ac5-8142-9425cb526475" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_1e99f94e-e33b-4bd3-bf98-5bc8c1990a2d" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent_deee2fed-c43f-4ac5-8142-9425cb526475" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_9f31ea2a-d2bc-4b56-ad68-99af6c6d2661" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_ffa86820-06b6-4eae-853a-1fcf9e2dcb2f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/DescriptionofBusinessDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#DescriptionofBusinessDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/DescriptionofBusinessDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_86962f5e-efaf-4b5e-9d68-b37a375d3c6f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1ebf4a29-2499-46de-ab04-665a07abd665" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_86962f5e-efaf-4b5e-9d68-b37a375d3c6f" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1ebf4a29-2499-46de-ab04-665a07abd665" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_8f8ea409-51a0-4183-abd8-8668f55cf4b7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_1ebf4a29-2499-46de-ab04-665a07abd665" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_8f8ea409-51a0-4183-abd8-8668f55cf4b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8f8ea409-51a0-4183-abd8-8668f55cf4b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8f8ea409-51a0-4183-abd8-8668f55cf4b7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_8f8ea409-51a0-4183-abd8-8668f55cf4b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_514cb3f7-f7dd-4c55-83e4-12ae09207464" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_8f8ea409-51a0-4183-abd8-8668f55cf4b7" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_514cb3f7-f7dd-4c55-83e4-12ae09207464" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_HydrafacialMember_b53df146-f32b-4ea4-b518-9730579378dc" xlink:href="skin-20240331.xsd#skin_HydrafacialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_514cb3f7-f7dd-4c55-83e4-12ae09207464" xlink:to="loc_skin_HydrafacialMember_b53df146-f32b-4ea4-b518-9730579378dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_MergerSubIIMember_8e5049c8-f505-4dc7-a07b-b70b40f7f829" xlink:href="skin-20240331.xsd#skin_MergerSubIIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_514cb3f7-f7dd-4c55-83e4-12ae09207464" xlink:to="loc_skin_MergerSubIIMember_8e5049c8-f505-4dc7-a07b-b70b40f7f829" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_HydrafacialAndSubsidiariesMember_eb01d2e4-e9c4-4c6a-9733-11e85c289746" xlink:href="skin-20240331.xsd#skin_HydrafacialAndSubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_514cb3f7-f7dd-4c55-83e4-12ae09207464" xlink:to="loc_skin_HydrafacialAndSubsidiariesMember_eb01d2e4-e9c4-4c6a-9733-11e85c289746" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_d316c466-f3cc-4507-8ab5-e30f3a86e12c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_86962f5e-efaf-4b5e-9d68-b37a375d3c6f" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_d316c466-f3cc-4507-8ab5-e30f3a86e12c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_8062fb22-d187-4f0f-ae26-d704e2607d86" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_86962f5e-efaf-4b5e-9d68-b37a375d3c6f" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_8062fb22-d187-4f0f-ae26-d704e2607d86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryWriteDown_f05f2f37-bdd9-46d0-b20d-314ed66587a5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InventoryWriteDown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_86962f5e-efaf-4b5e-9d68-b37a375d3c6f" xlink:to="loc_us-gaap_InventoryWriteDown_f05f2f37-bdd9-46d0-b20d-314ed66587a5" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/RevenueRevenueDisaggregatedDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#RevenueRevenueDisaggregatedDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/RevenueRevenueDisaggregatedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_527038ab-fdbb-4ef4-b9d7-01fc3fed1391" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_4997b537-c057-487d-b7ef-580862311e54" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_527038ab-fdbb-4ef4-b9d7-01fc3fed1391" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_4997b537-c057-487d-b7ef-580862311e54" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_9bef0a45-12f5-4b24-a494-7d8e457bdab6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_4997b537-c057-487d-b7ef-580862311e54" xlink:to="loc_srt_ProductOrServiceAxis_9bef0a45-12f5-4b24-a494-7d8e457bdab6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_9bef0a45-12f5-4b24-a494-7d8e457bdab6_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_9bef0a45-12f5-4b24-a494-7d8e457bdab6" xlink:to="loc_srt_ProductsAndServicesDomain_9bef0a45-12f5-4b24-a494-7d8e457bdab6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_36ff4fbd-c418-484a-b1c1-59ce0edb7ac4" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_9bef0a45-12f5-4b24-a494-7d8e457bdab6" xlink:to="loc_srt_ProductsAndServicesDomain_36ff4fbd-c418-484a-b1c1-59ce0edb7ac4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_DeliverySystemsMember_3449ddd4-10b9-4333-a3a5-c96194edc364" xlink:href="skin-20240331.xsd#skin_DeliverySystemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_36ff4fbd-c418-484a-b1c1-59ce0edb7ac4" xlink:to="loc_skin_DeliverySystemsMember_3449ddd4-10b9-4333-a3a5-c96194edc364" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_ConsumablesMember_ea7f3890-3a5f-4e5e-aaf3-91b1304428bf" xlink:href="skin-20240331.xsd#skin_ConsumablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_36ff4fbd-c418-484a-b1c1-59ce0edb7ac4" xlink:to="loc_skin_ConsumablesMember_ea7f3890-3a5f-4e5e-aaf3-91b1304428bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_78e5a7e9-fdf0-4755-bbec-55f3f9302176" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_527038ab-fdbb-4ef4-b9d7-01fc3fed1391" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_78e5a7e9-fdf0-4755-bbec-55f3f9302176" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/RevenueGeographicRegionDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#RevenueGeographicRegionDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/RevenueGeographicRegionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_36f92fb9-9d02-4280-a396-df7003b0808b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_f463de21-b956-4067-99b7-c62f7355b1ae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_36f92fb9-9d02-4280-a396-df7003b0808b" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_f463de21-b956-4067-99b7-c62f7355b1ae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_a3b0a5fb-6d35-419e-8754-96e9f212eb19" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_f463de21-b956-4067-99b7-c62f7355b1ae" xlink:to="loc_srt_StatementGeographicalAxis_a3b0a5fb-6d35-419e-8754-96e9f212eb19" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_a3b0a5fb-6d35-419e-8754-96e9f212eb19_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_a3b0a5fb-6d35-419e-8754-96e9f212eb19" xlink:to="loc_srt_SegmentGeographicalDomain_a3b0a5fb-6d35-419e-8754-96e9f212eb19_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_ddc0dbda-c7d5-44af-8ab8-66ba66790066" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_a3b0a5fb-6d35-419e-8754-96e9f212eb19" xlink:to="loc_srt_SegmentGeographicalDomain_ddc0dbda-c7d5-44af-8ab8-66ba66790066" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_2b3eadae-4132-443f-8de1-f25f4355879e" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_ddc0dbda-c7d5-44af-8ab8-66ba66790066" xlink:to="loc_country_US_2b3eadae-4132-443f-8de1-f25f4355879e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_f8e06316-a48e-40e0-a3ac-93e8137758bb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_ddc0dbda-c7d5-44af-8ab8-66ba66790066" xlink:to="loc_srt_AsiaPacificMember_f8e06316-a48e-40e0-a3ac-93e8137758bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_a61bd3b5-8c9d-4236-ba55-1dd59e3dd3e9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_ddc0dbda-c7d5-44af-8ab8-66ba66790066" xlink:to="loc_us-gaap_EMEAMember_a61bd3b5-8c9d-4236-ba55-1dd59e3dd3e9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_642274c9-f008-459e-9654-ea8357bb3548" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_36f92fb9-9d02-4280-a396-df7003b0808b" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_642274c9-f008-459e-9654-ea8357bb3548" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/FairValueMeasurementsScheduleofassetsandliabilitiesmeasuredatfairvalueonrecurringbasisDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#FairValueMeasurementsScheduleofassetsandliabilitiesmeasuredatfairvalueonrecurringbasisDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/FairValueMeasurementsScheduleofassetsandliabilitiesmeasuredatfairvalueonrecurringbasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c8980844-950b-4992-b617-d1c284ca9af5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_a18df906-40f0-4172-a0dc-0f90fcde2eef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c8980844-950b-4992-b617-d1c284ca9af5" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_a18df906-40f0-4172-a0dc-0f90fcde2eef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_f6d55447-1b46-4d8f-848b-9f277c04e380" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_a18df906-40f0-4172-a0dc-0f90fcde2eef" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_f6d55447-1b46-4d8f-848b-9f277c04e380" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_f6d55447-1b46-4d8f-848b-9f277c04e380_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_f6d55447-1b46-4d8f-848b-9f277c04e380" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_f6d55447-1b46-4d8f-848b-9f277c04e380_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_93f04382-e076-4064-9119-74c9d257a029" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_f6d55447-1b46-4d8f-848b-9f277c04e380" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_93f04382-e076-4064-9119-74c9d257a029" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_63120abe-075b-47ec-ae56-8bfe9cd2e466" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_93f04382-e076-4064-9119-74c9d257a029" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_63120abe-075b-47ec-ae56-8bfe9cd2e466" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_0086ae72-78e6-4e18-87b1-d72fa9a2ce3d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_a18df906-40f0-4172-a0dc-0f90fcde2eef" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_0086ae72-78e6-4e18-87b1-d72fa9a2ce3d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0086ae72-78e6-4e18-87b1-d72fa9a2ce3d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_0086ae72-78e6-4e18-87b1-d72fa9a2ce3d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_0086ae72-78e6-4e18-87b1-d72fa9a2ce3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_08fd3f6a-fde7-424e-9f4c-12901fe11569" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_0086ae72-78e6-4e18-87b1-d72fa9a2ce3d" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_08fd3f6a-fde7-424e-9f4c-12901fe11569" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_671439b2-739a-4d5d-b3e0-451df563399a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_08fd3f6a-fde7-424e-9f4c-12901fe11569" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_671439b2-739a-4d5d-b3e0-451df563399a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_152c4f58-0c99-418e-b23a-39f9fc8fb427" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_08fd3f6a-fde7-424e-9f4c-12901fe11569" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_152c4f58-0c99-418e-b23a-39f9fc8fb427" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_d20aa47b-ca74-469c-bdc1-4929c27f1108" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_08fd3f6a-fde7-424e-9f4c-12901fe11569" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_d20aa47b-ca74-469c-bdc1-4929c27f1108" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_b210b975-13fe-4578-9edc-3e981444837c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_a18df906-40f0-4172-a0dc-0f90fcde2eef" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_b210b975-13fe-4578-9edc-3e981444837c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_b210b975-13fe-4578-9edc-3e981444837c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_b210b975-13fe-4578-9edc-3e981444837c" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_b210b975-13fe-4578-9edc-3e981444837c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_df5c597e-e5a9-4e66-a444-6cb58211d9d8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_b210b975-13fe-4578-9edc-3e981444837c" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_df5c597e-e5a9-4e66-a444-6cb58211d9d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_734a1006-f1ff-4a27-b7cf-7f9f65db704a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_df5c597e-e5a9-4e66-a444-6cb58211d9d8" xlink:to="loc_us-gaap_MoneyMarketFundsMember_734a1006-f1ff-4a27-b7cf-7f9f65db704a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_InternationalTreasuriesMember_205b99ec-38a4-4656-856f-e9d817909774" xlink:href="skin-20240331.xsd#skin_InternationalTreasuriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_df5c597e-e5a9-4e66-a444-6cb58211d9d8" xlink:to="loc_skin_InternationalTreasuriesMember_205b99ec-38a4-4656-856f-e9d817909774" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_6e10f255-8e41-49d8-b49a-53e741b8b0e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_a18df906-40f0-4172-a0dc-0f90fcde2eef" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_6e10f255-8e41-49d8-b49a-53e741b8b0e4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_6e10f255-8e41-49d8-b49a-53e741b8b0e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_6e10f255-8e41-49d8-b49a-53e741b8b0e4" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_6e10f255-8e41-49d8-b49a-53e741b8b0e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_90b69922-0c23-4a33-aefa-24b39272134f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_6e10f255-8e41-49d8-b49a-53e741b8b0e4" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_90b69922-0c23-4a33-aefa-24b39272134f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_PrivatePlacementWarrantsMember_c60521f9-b305-4884-8cd6-af7b9f2b369e" xlink:href="skin-20240331.xsd#skin_PrivatePlacementWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_90b69922-0c23-4a33-aefa-24b39272134f" xlink:to="loc_skin_PrivatePlacementWarrantsMember_c60521f9-b305-4884-8cd6-af7b9f2b369e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_c1858e7d-d3d1-4afb-95d1-8ec6d7b1d4b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c8980844-950b-4992-b617-d1c284ca9af5" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_c1858e7d-d3d1-4afb-95d1-8ec6d7b1d4b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_a73636f0-8f29-448f-bbca-cbbe0604cede" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_c1858e7d-d3d1-4afb-95d1-8ec6d7b1d4b8" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_a73636f0-8f29-448f-bbca-cbbe0604cede" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialLiabilitiesFairValueDisclosureAbstract_cd5c11ed-5a7d-4bb6-9d98-1611ce86c750" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinancialLiabilitiesFairValueDisclosureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_c8980844-950b-4992-b617-d1c284ca9af5" xlink:to="loc_us-gaap_FinancialLiabilitiesFairValueDisclosureAbstract_cd5c11ed-5a7d-4bb6-9d98-1611ce86c750" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WarrantsAndRightsOutstanding_02683a75-88fd-4cc6-9963-50b4c3c45889" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WarrantsAndRightsOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialLiabilitiesFairValueDisclosureAbstract_cd5c11ed-5a7d-4bb6-9d98-1611ce86c750" xlink:to="loc_us-gaap_WarrantsAndRightsOutstanding_02683a75-88fd-4cc6-9963-50b4c3c45889" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#FairValueMeasurementsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/FairValueMeasurementsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ff796098-5236-4674-9954-fdd2be030a8e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fecaa5f6-042c-44be-8f57-9961e152d222" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ff796098-5236-4674-9954-fdd2be030a8e" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fecaa5f6-042c-44be-8f57-9961e152d222" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_2458d510-b4d0-4f3c-bc61-3ce48ac413f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_fecaa5f6-042c-44be-8f57-9961e152d222" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_2458d510-b4d0-4f3c-bc61-3ce48ac413f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_2458d510-b4d0-4f3c-bc61-3ce48ac413f0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_2458d510-b4d0-4f3c-bc61-3ce48ac413f0" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_2458d510-b4d0-4f3c-bc61-3ce48ac413f0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_4b806e4e-1ada-4813-a4cf-0689d25df6b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_2458d510-b4d0-4f3c-bc61-3ce48ac413f0" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_4b806e4e-1ada-4813-a4cf-0689d25df6b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_PrivatePlacementWarrantsMember_675d9d22-87e7-497c-a52b-8e483ba36300" xlink:href="skin-20240331.xsd#skin_PrivatePlacementWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_4b806e4e-1ada-4813-a4cf-0689d25df6b5" xlink:to="loc_skin_PrivatePlacementWarrantsMember_675d9d22-87e7-497c-a52b-8e483ba36300" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightOutstanding_ea12dfe4-4f0b-4e66-b524-38e2dd9ad1e8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ff796098-5236-4674-9954-fdd2be030a8e" xlink:to="loc_us-gaap_ClassOfWarrantOrRightOutstanding_ea12dfe4-4f0b-4e66-b524-38e2dd9ad1e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_9c95d33d-3bec-4785-822d-d85fcaf78e88" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_ff796098-5236-4674-9954-fdd2be030a8e" xlink:to="loc_us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1_9c95d33d-3bec-4785-822d-d85fcaf78e88" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/PropertyandEquipmentnetDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#PropertyandEquipmentnetDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/PropertyandEquipmentnetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c8b47ae5-e91a-405f-87b9-f45681e8bee4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_9b20f074-7537-4890-b28c-b1731af1be9e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c8b47ae5-e91a-405f-87b9-f45681e8bee4" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_9b20f074-7537-4890-b28c-b1731af1be9e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4a826ccc-37df-4810-8af2-9ec28d18fa84" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_9b20f074-7537-4890-b28c-b1731af1be9e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4a826ccc-37df-4810-8af2-9ec28d18fa84" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4a826ccc-37df-4810-8af2-9ec28d18fa84_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4a826ccc-37df-4810-8af2-9ec28d18fa84" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_4a826ccc-37df-4810-8af2-9ec28d18fa84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_77d1a4bd-9e55-461d-9963-0ecc78c3ce91" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_4a826ccc-37df-4810-8af2-9ec28d18fa84" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_77d1a4bd-9e55-461d-9963-0ecc78c3ce91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_DepreciablePropertyPlantAndEquipmentMember_7d98d97e-e173-4ded-975b-d99d4f34c3b0" xlink:href="skin-20240331.xsd#skin_DepreciablePropertyPlantAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_77d1a4bd-9e55-461d-9963-0ecc78c3ce91" xlink:to="loc_skin_DepreciablePropertyPlantAndEquipmentMember_7d98d97e-e173-4ded-975b-d99d4f34c3b0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_f209f2e5-a6a4-45cd-86bf-df76612aa786" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_skin_DepreciablePropertyPlantAndEquipmentMember_7d98d97e-e173-4ded-975b-d99d4f34c3b0" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_f209f2e5-a6a4-45cd-86bf-df76612aa786" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_a92a008e-ce9f-4b85-b1fc-d56b983cc234" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_skin_DepreciablePropertyPlantAndEquipmentMember_7d98d97e-e173-4ded-975b-d99d4f34c3b0" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_a92a008e-ce9f-4b85-b1fc-d56b983cc234" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_078c6625-864d-4692-a791-4798ae0a9163" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_skin_DepreciablePropertyPlantAndEquipmentMember_7d98d97e-e173-4ded-975b-d99d4f34c3b0" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_078c6625-864d-4692-a791-4798ae0a9163" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OfficeEquipmentMember_8dff9c88-83da-4904-ace4-4260e9cc5412" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OfficeEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_skin_DepreciablePropertyPlantAndEquipmentMember_7d98d97e-e173-4ded-975b-d99d4f34c3b0" xlink:to="loc_us-gaap_OfficeEquipmentMember_8dff9c88-83da-4904-ace4-4260e9cc5412" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ToolsDiesAndMoldsMember_c814b2e0-4ef0-4f45-be7e-6265241a342b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ToolsDiesAndMoldsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_skin_DepreciablePropertyPlantAndEquipmentMember_7d98d97e-e173-4ded-975b-d99d4f34c3b0" xlink:to="loc_us-gaap_ToolsDiesAndMoldsMember_c814b2e0-4ef0-4f45-be7e-6265241a342b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VehiclesMember_755de423-b6f7-4073-a3e3-77a8f0788d34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VehiclesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_skin_DepreciablePropertyPlantAndEquipmentMember_7d98d97e-e173-4ded-975b-d99d4f34c3b0" xlink:to="loc_us-gaap_VehiclesMember_755de423-b6f7-4073-a3e3-77a8f0788d34" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_032bbd62-59b7-4f17-a053-4aa7623eaa2a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_77d1a4bd-9e55-461d-9963-0ecc78c3ce91" xlink:to="loc_us-gaap_ConstructionInProgressMember_032bbd62-59b7-4f17-a053-4aa7623eaa2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_6f48528e-c343-4705-8a23-febde7917f95" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_9b20f074-7537-4890-b28c-b1731af1be9e" xlink:to="loc_srt_RangeAxis_6f48528e-c343-4705-8a23-febde7917f95" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6f48528e-c343-4705-8a23-febde7917f95_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_6f48528e-c343-4705-8a23-febde7917f95" xlink:to="loc_srt_RangeMember_6f48528e-c343-4705-8a23-febde7917f95_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_89635424-2a60-437d-a9a1-fb4f14bacbbe" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_6f48528e-c343-4705-8a23-febde7917f95" xlink:to="loc_srt_RangeMember_89635424-2a60-437d-a9a1-fb4f14bacbbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_a6c9f054-fb12-4c09-81be-8509eaa85445" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_89635424-2a60-437d-a9a1-fb4f14bacbbe" xlink:to="loc_srt_MinimumMember_a6c9f054-fb12-4c09-81be-8509eaa85445" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_03aa815b-6444-4b05-bdef-c7b45de4750b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_89635424-2a60-437d-a9a1-fb4f14bacbbe" xlink:to="loc_srt_MaximumMember_03aa815b-6444-4b05-bdef-c7b45de4750b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_20ab9647-0dac-4945-8f83-2a9ab01c2b83" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c8b47ae5-e91a-405f-87b9-f45681e8bee4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_20ab9647-0dac-4945-8f83-2a9ab01c2b83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_6ef9f26e-538a-4a46-b718-f3f000cb7b13" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c8b47ae5-e91a-405f-87b9-f45681e8bee4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization_6ef9f26e-538a-4a46-b718-f3f000cb7b13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_39a81429-1010-49fa-9ff5-58280ba1ce1a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c8b47ae5-e91a-405f-87b9-f45681e8bee4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization_39a81429-1010-49fa-9ff5-58280ba1ce1a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_29cb7f02-e37f-4d7a-9294-67bbede3a92a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_c8b47ae5-e91a-405f-87b9-f45681e8bee4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization_29cb7f02-e37f-4d7a-9294-67bbede3a92a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/GoodwillandIntangibleAssetsnetIntangibleAssetsDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#GoodwillandIntangibleAssetsnetIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/GoodwillandIntangibleAssetsnetIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_da50ca6d-dd3d-42d2-a624-3502c162c635" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_7c2e4f7f-bc46-46f5-afe7-0a7df2bf3014" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_da50ca6d-dd3d-42d2-a624-3502c162c635" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_7c2e4f7f-bc46-46f5-afe7-0a7df2bf3014" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_2183e2c6-797b-4b0c-9ca9-40ff44cb4695" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_7c2e4f7f-bc46-46f5-afe7-0a7df2bf3014" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_2183e2c6-797b-4b0c-9ca9-40ff44cb4695" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2183e2c6-797b-4b0c-9ca9-40ff44cb4695_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_2183e2c6-797b-4b0c-9ca9-40ff44cb4695" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2183e2c6-797b-4b0c-9ca9-40ff44cb4695_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d657e014-743d-469a-b368-a232c65e6f1c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_2183e2c6-797b-4b0c-9ca9-40ff44cb4695" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d657e014-743d-469a-b368-a232c65e6f1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_c16a5a0c-e550-4039-a755-fc001c726b91" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d657e014-743d-469a-b368-a232c65e6f1c" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_c16a5a0c-e550-4039-a755-fc001c726b91" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_7513f0ad-a85f-4af9-a68d-e96320122ded" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d657e014-743d-469a-b368-a232c65e6f1c" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_7513f0ad-a85f-4af9-a68d-e96320122ded" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_c89cb7c4-d269-42ba-8717-0c660ab947de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d657e014-743d-469a-b368-a232c65e6f1c" xlink:to="loc_us-gaap_CustomerRelationshipsMember_c89cb7c4-d269-42ba-8717-0c660ab947de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksMember_1eebd3e3-e7d0-49a7-9d85-f69e3ecd8b3a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d657e014-743d-469a-b368-a232c65e6f1c" xlink:to="loc_us-gaap_TrademarksMember_1eebd3e3-e7d0-49a7-9d85-f69e3ecd8b3a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncompeteAgreementsMember_308497c9-dcf5-481a-9e37-14fd1d2eeb55" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncompeteAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d657e014-743d-469a-b368-a232c65e6f1c" xlink:to="loc_us-gaap_NoncompeteAgreementsMember_308497c9-dcf5-481a-9e37-14fd1d2eeb55" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PatentsMember_2c16172f-0dba-4a3c-a47a-b67220635910" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PatentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_d657e014-743d-469a-b368-a232c65e6f1c" xlink:to="loc_us-gaap_PatentsMember_2c16172f-0dba-4a3c-a47a-b67220635910" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e5216501-f032-43aa-a5f6-937602552f7f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_7c2e4f7f-bc46-46f5-afe7-0a7df2bf3014" xlink:to="loc_srt_RangeAxis_e5216501-f032-43aa-a5f6-937602552f7f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e5216501-f032-43aa-a5f6-937602552f7f_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_e5216501-f032-43aa-a5f6-937602552f7f" xlink:to="loc_srt_RangeMember_e5216501-f032-43aa-a5f6-937602552f7f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_c023e8a0-8cf2-451a-972d-4f64d181a77a" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_e5216501-f032-43aa-a5f6-937602552f7f" xlink:to="loc_srt_RangeMember_c023e8a0-8cf2-451a-972d-4f64d181a77a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_9852832b-96f5-48cc-805d-d189e84594fb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c023e8a0-8cf2-451a-972d-4f64d181a77a" xlink:to="loc_srt_MinimumMember_9852832b-96f5-48cc-805d-d189e84594fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2473f723-4084-4a46-bbb3-4b13d28ce3ea" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_c023e8a0-8cf2-451a-972d-4f64d181a77a" xlink:to="loc_srt_MaximumMember_2473f723-4084-4a46-bbb3-4b13d28ce3ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_14b8a080-1ed9-4e58-a198-6cacf976bb2b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_da50ca6d-dd3d-42d2-a624-3502c162c635" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_14b8a080-1ed9-4e58-a198-6cacf976bb2b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c8d80423-6dde-4486-90bb-02d5cd22edf8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_da50ca6d-dd3d-42d2-a624-3502c162c635" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_c8d80423-6dde-4486-90bb-02d5cd22edf8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_a99b2fc5-7d35-4ca3-8427-63cf6e10b4bf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_da50ca6d-dd3d-42d2-a624-3502c162c635" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_a99b2fc5-7d35-4ca3-8427-63cf6e10b4bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_1eea2b3f-4485-45aa-990a-60a8a323b4ee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_da50ca6d-dd3d-42d2-a624-3502c162c635" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_1eea2b3f-4485-45aa-990a-60a8a323b4ee" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/GoodwillandIntangibleAssetsnetNarrativeDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#GoodwillandIntangibleAssetsnetNarrativeDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/GoodwillandIntangibleAssetsnetNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d055ca20-6e10-4cae-b47c-9f17aed348e8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_b0cbf775-358e-4381-b6d9-25c644087095" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d055ca20-6e10-4cae-b47c-9f17aed348e8" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_b0cbf775-358e-4381-b6d9-25c644087095" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionAxis_72afc963-9b86-4d3a-9048-50dc7ec05fb3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_b0cbf775-358e-4381-b6d9-25c644087095" xlink:to="loc_us-gaap_AssetAcquisitionAxis_72afc963-9b86-4d3a-9048-50dc7ec05fb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionDomain_72afc963-9b86-4d3a-9048-50dc7ec05fb3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetAcquisitionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AssetAcquisitionAxis_72afc963-9b86-4d3a-9048-50dc7ec05fb3" xlink:to="loc_us-gaap_AssetAcquisitionDomain_72afc963-9b86-4d3a-9048-50dc7ec05fb3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionDomain_026fdfdd-aff6-4d0e-8838-b6480cd1e2c9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetAcquisitionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AssetAcquisitionAxis_72afc963-9b86-4d3a-9048-50dc7ec05fb3" xlink:to="loc_us-gaap_AssetAcquisitionDomain_026fdfdd-aff6-4d0e-8838-b6480cd1e2c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_EstheticMedicalIncMember_419fce16-474b-4491-a4a1-1ced26782d89" xlink:href="skin-20240331.xsd#skin_EstheticMedicalIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionDomain_026fdfdd-aff6-4d0e-8838-b6480cd1e2c9" xlink:to="loc_skin_EstheticMedicalIncMember_419fce16-474b-4491-a4a1-1ced26782d89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_AnacapaAestheticsLLCMember_9f9d823e-d13e-485f-a430-4b0a998d5ec9" xlink:href="skin-20240331.xsd#skin_AnacapaAestheticsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetAcquisitionDomain_026fdfdd-aff6-4d0e-8838-b6480cd1e2c9" xlink:to="loc_skin_AnacapaAestheticsLLCMember_9f9d823e-d13e-485f-a430-4b0a998d5ec9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a01eda2d-53cc-4895-b8cb-ee757c8709fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_b0cbf775-358e-4381-b6d9-25c644087095" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a01eda2d-53cc-4895-b8cb-ee757c8709fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a01eda2d-53cc-4895-b8cb-ee757c8709fc_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a01eda2d-53cc-4895-b8cb-ee757c8709fc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a01eda2d-53cc-4895-b8cb-ee757c8709fc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9def5028-56f4-40d8-90e5-d7f7a2cdb178" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_a01eda2d-53cc-4895-b8cb-ee757c8709fc" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9def5028-56f4-40d8-90e5-d7f7a2cdb178" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DevelopedTechnologyRightsMember_6222151e-f8ad-4893-8601-1edb6280bce2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DevelopedTechnologyRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9def5028-56f4-40d8-90e5-d7f7a2cdb178" xlink:to="loc_us-gaap_DevelopedTechnologyRightsMember_6222151e-f8ad-4893-8601-1edb6280bce2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionConsiderationTransferred_526785a9-49cc-4fcb-b5a3-e8ead9d11d83" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetAcquisitionConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d055ca20-6e10-4cae-b47c-9f17aed348e8" xlink:to="loc_us-gaap_AssetAcquisitionConsiderationTransferred_526785a9-49cc-4fcb-b5a3-e8ead9d11d83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_AssetAcquisitionEquityInterestIssuedOrIssuableNumberOfShares_2695cdd4-f6db-4b6b-8947-a64bd91a37db" xlink:href="skin-20240331.xsd#skin_AssetAcquisitionEquityInterestIssuedOrIssuableNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d055ca20-6e10-4cae-b47c-9f17aed348e8" xlink:to="loc_skin_AssetAcquisitionEquityInterestIssuedOrIssuableNumberOfShares_2695cdd4-f6db-4b6b-8947-a64bd91a37db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_AssetAcquisitionEquityInterestIssuedOrIssuableValue_dfa440ef-1f1c-44f1-b799-ad232b6ffe42" xlink:href="skin-20240331.xsd#skin_AssetAcquisitionEquityInterestIssuedOrIssuableValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d055ca20-6e10-4cae-b47c-9f17aed348e8" xlink:to="loc_skin_AssetAcquisitionEquityInterestIssuedOrIssuableValue_dfa440ef-1f1c-44f1-b799-ad232b6ffe42" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetAcquisitionConsiderationTransferredContingentConsideration_ab235cd5-6c56-486f-b11b-68a9d6ffd64a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetAcquisitionConsiderationTransferredContingentConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d055ca20-6e10-4cae-b47c-9f17aed348e8" xlink:to="loc_us-gaap_AssetAcquisitionConsiderationTransferredContingentConsideration_ab235cd5-6c56-486f-b11b-68a9d6ffd64a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_AssetAcquisitionContingentConsiderationConsideredProbableAsOfTheAcquisitionDate_88029aca-b891-4bf7-9f64-efad07865dd7" xlink:href="skin-20240331.xsd#skin_AssetAcquisitionContingentConsiderationConsideredProbableAsOfTheAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d055ca20-6e10-4cae-b47c-9f17aed348e8" xlink:to="loc_skin_AssetAcquisitionContingentConsiderationConsideredProbableAsOfTheAcquisitionDate_88029aca-b891-4bf7-9f64-efad07865dd7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_AssetAcquisitionIntangibleAssetsTaxBasisAcquiredInExcessOfPurchasePrice_0846a664-5096-444f-a995-8c5b4ba96547" xlink:href="skin-20240331.xsd#skin_AssetAcquisitionIntangibleAssetsTaxBasisAcquiredInExcessOfPurchasePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d055ca20-6e10-4cae-b47c-9f17aed348e8" xlink:to="loc_skin_AssetAcquisitionIntangibleAssetsTaxBasisAcquiredInExcessOfPurchasePrice_0846a664-5096-444f-a995-8c5b4ba96547" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1a8a6725-26d6-4188-9893-22eee89424d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d055ca20-6e10-4cae-b47c-9f17aed348e8" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_1a8a6725-26d6-4188-9893-22eee89424d6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_AssetAcquisitionContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability_95817771-f881-4c7a-8026-1cf2160c2884" xlink:href="skin-20240331.xsd#skin_AssetAcquisitionContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d055ca20-6e10-4cae-b47c-9f17aed348e8" xlink:to="loc_skin_AssetAcquisitionContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability_95817771-f881-4c7a-8026-1cf2160c2884" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_8c2387a7-0598-482c-9c60-5070bfff4b67" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_d055ca20-6e10-4cae-b47c-9f17aed348e8" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_8c2387a7-0598-482c-9c60-5070bfff4b67" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/LongtermDebtNarrativeDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#LongtermDebtNarrativeDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/LongtermDebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_8d7b8112-a11a-47de-9326-92006e0b5cb9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_us-gaap_DebtInstrumentTable_8d7b8112-a11a-47de-9326-92006e0b5cb9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_4c6c5adf-3e96-4e8f-95b5-0dba87436ff9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8d7b8112-a11a-47de-9326-92006e0b5cb9" xlink:to="loc_us-gaap_CreditFacilityAxis_4c6c5adf-3e96-4e8f-95b5-0dba87436ff9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_4c6c5adf-3e96-4e8f-95b5-0dba87436ff9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_4c6c5adf-3e96-4e8f-95b5-0dba87436ff9" xlink:to="loc_us-gaap_CreditFacilityDomain_4c6c5adf-3e96-4e8f-95b5-0dba87436ff9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_ee4d24f1-d92d-44a6-900c-d18894005266" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_4c6c5adf-3e96-4e8f-95b5-0dba87436ff9" xlink:to="loc_us-gaap_CreditFacilityDomain_ee4d24f1-d92d-44a6-900c-d18894005266" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_2dafbeed-d614-4588-b2b2-acc837cd8814" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ee4d24f1-d92d-44a6-900c-d18894005266" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_2dafbeed-d614-4588-b2b2-acc837cd8814" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_da50d8ed-6cc6-49c6-aeb7-6c09ce1f5bff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8d7b8112-a11a-47de-9326-92006e0b5cb9" xlink:to="loc_us-gaap_DebtInstrumentAxis_da50d8ed-6cc6-49c6-aeb7-6c09ce1f5bff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_da50d8ed-6cc6-49c6-aeb7-6c09ce1f5bff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_da50d8ed-6cc6-49c6-aeb7-6c09ce1f5bff" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_da50d8ed-6cc6-49c6-aeb7-6c09ce1f5bff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_9a04927f-e6ce-4150-9794-d3cad61fe012" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_da50d8ed-6cc6-49c6-aeb7-6c09ce1f5bff" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_9a04927f-e6ce-4150-9794-d3cad61fe012" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_CreditAgreementDue2026Member_4e13174a-e36f-414b-b84a-28d62ce89b2a" xlink:href="skin-20240331.xsd#skin_CreditAgreementDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_9a04927f-e6ce-4150-9794-d3cad61fe012" xlink:to="loc_skin_CreditAgreementDue2026Member_4e13174a-e36f-414b-b84a-28d62ce89b2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_A125ConvertibleSeniorNotesDue2026Member_39458bf5-b622-45bc-b9e9-b570d8676d14" xlink:href="skin-20240331.xsd#skin_A125ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_9a04927f-e6ce-4150-9794-d3cad61fe012" xlink:to="loc_skin_A125ConvertibleSeniorNotesDue2026Member_39458bf5-b622-45bc-b9e9-b570d8676d14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_2bf8278f-d8f7-437b-8e3a-feb6b4bed99d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8d7b8112-a11a-47de-9326-92006e0b5cb9" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_2bf8278f-d8f7-437b-8e3a-feb6b4bed99d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_2bf8278f-d8f7-437b-8e3a-feb6b4bed99d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2bf8278f-d8f7-437b-8e3a-feb6b4bed99d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_2bf8278f-d8f7-437b-8e3a-feb6b4bed99d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_fb910e68-2ab6-4dc8-b9f6-df966893e0d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_2bf8278f-d8f7-437b-8e3a-feb6b4bed99d" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_fb910e68-2ab6-4dc8-b9f6-df966893e0d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_9e066fca-9110-4b09-a8c8-5ffecb55e557" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fb910e68-2ab6-4dc8-b9f6-df966893e0d3" xlink:to="loc_us-gaap_LineOfCreditMember_9e066fca-9110-4b09-a8c8-5ffecb55e557" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_e4342ed1-fdd0-4e74-a22e-b5d642f38c9a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_fb910e68-2ab6-4dc8-b9f6-df966893e0d3" xlink:to="loc_us-gaap_ConvertibleDebtMember_e4342ed1-fdd0-4e74-a22e-b5d642f38c9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OptionIndexedToIssuersEquityEquityAxis_cc462c17-e2e7-4d80-ac15-54149e91d4c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OptionIndexedToIssuersEquityEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8d7b8112-a11a-47de-9326-92006e0b5cb9" xlink:to="loc_us-gaap_OptionIndexedToIssuersEquityEquityAxis_cc462c17-e2e7-4d80-ac15-54149e91d4c8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OptionIndexedToIssuersEquityTypeDomain_cc462c17-e2e7-4d80-ac15-54149e91d4c8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OptionIndexedToIssuersEquityTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OptionIndexedToIssuersEquityEquityAxis_cc462c17-e2e7-4d80-ac15-54149e91d4c8" xlink:to="loc_us-gaap_OptionIndexedToIssuersEquityTypeDomain_cc462c17-e2e7-4d80-ac15-54149e91d4c8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OptionIndexedToIssuersEquityTypeDomain_ba887a67-15e0-4aa1-88fd-fdfe2ed56001" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OptionIndexedToIssuersEquityTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OptionIndexedToIssuersEquityEquityAxis_cc462c17-e2e7-4d80-ac15-54149e91d4c8" xlink:to="loc_us-gaap_OptionIndexedToIssuersEquityTypeDomain_ba887a67-15e0-4aa1-88fd-fdfe2ed56001" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CallOptionMember_594b856b-d9b6-4d49-8029-7e83309bed9b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CallOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OptionIndexedToIssuersEquityTypeDomain_ba887a67-15e0-4aa1-88fd-fdfe2ed56001" xlink:to="loc_us-gaap_CallOptionMember_594b856b-d9b6-4d49-8029-7e83309bed9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_9a0d8b08-b2b6-41c9-aa68-d96608fedd45" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8d7b8112-a11a-47de-9326-92006e0b5cb9" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_9a0d8b08-b2b6-41c9-aa68-d96608fedd45" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_9a0d8b08-b2b6-41c9-aa68-d96608fedd45_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_9a0d8b08-b2b6-41c9-aa68-d96608fedd45" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_9a0d8b08-b2b6-41c9-aa68-d96608fedd45_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_c6114371-610e-4e4f-bc0e-2250427e5875" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_9a0d8b08-b2b6-41c9-aa68-d96608fedd45" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_c6114371-610e-4e4f-bc0e-2250427e5875" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_5a4ed61e-27fc-4e20-81d6-d05fc21dfb54" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_c6114371-610e-4e4f-bc0e-2250427e5875" xlink:to="loc_us-gaap_SubsequentEventMember_5a4ed61e-27fc-4e20-81d6-d05fc21dfb54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_79303e6f-c407-4bd2-b9a9-dd081c021421" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_8d7b8112-a11a-47de-9326-92006e0b5cb9" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_79303e6f-c407-4bd2-b9a9-dd081c021421" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_79303e6f-c407-4bd2-b9a9-dd081c021421_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_79303e6f-c407-4bd2-b9a9-dd081c021421" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_79303e6f-c407-4bd2-b9a9-dd081c021421_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_d903a437-068e-4b34-8952-a471fc7c44e2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_79303e6f-c407-4bd2-b9a9-dd081c021421" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_d903a437-068e-4b34-8952-a471fc7c44e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_8028b3f5-0eac-4b01-8a5d-8515cb09fe39" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_d903a437-068e-4b34-8952-a471fc7c44e2" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_8028b3f5-0eac-4b01-8a5d-8515cb09fe39" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ce17e21d-fa26-42bf-a41d-5290959a6bb8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_ce17e21d-fa26-42bf-a41d-5290959a6bb8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_LineOfCreditFacilityAccordionFeatureIncreaseLimit_37d115fb-3abd-496a-ad18-b077dee0c84f" xlink:href="skin-20240331.xsd#skin_LineOfCreditFacilityAccordionFeatureIncreaseLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_skin_LineOfCreditFacilityAccordionFeatureIncreaseLimit_37d115fb-3abd-496a-ad18-b077dee0c84f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_2dfa1b36-e7f4-4f42-9126-50086e5196f1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_us-gaap_LongTermDebt_2dfa1b36-e7f4-4f42-9126-50086e5196f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_DebtInstrumentCovenantLeverageRatioMaximum_94a7a5c9-8b4d-4ba5-bfd3-0b2f2bf0156c" xlink:href="skin-20240331.xsd#skin_DebtInstrumentCovenantLeverageRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_skin_DebtInstrumentCovenantLeverageRatioMaximum_94a7a5c9-8b4d-4ba5-bfd3-0b2f2bf0156c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_DebtInstrumentCovenantFixedChargeCoverageRatioMinimum_dccfae3d-0397-482d-95ed-a66e482ca47d" xlink:href="skin-20240331.xsd#skin_DebtInstrumentCovenantFixedChargeCoverageRatioMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_skin_DebtInstrumentCovenantFixedChargeCoverageRatioMinimum_dccfae3d-0397-482d-95ed-a66e482ca47d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_7e10013c-9ba6-4bd4-a00f-b8b25a17076c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_7e10013c-9ba6-4bd4-a00f-b8b25a17076c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_3d854361-ae2f-4ca4-a89d-85167239b0fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_3d854361-ae2f-4ca4-a89d-85167239b0fe" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_DebtInstrumentAccordionFeatureSettlementPeriod_a74a3004-46f5-4429-9a02-fac29becc798" xlink:href="skin-20240331.xsd#skin_DebtInstrumentAccordionFeatureSettlementPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_skin_DebtInstrumentAccordionFeatureSettlementPeriod_a74a3004-46f5-4429-9a02-fac29becc798" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_DebtInstrumentAccordionFeatureIncreaseLimit_5a358206-fe6a-451d-ba4c-1b131f910ae5" xlink:href="skin-20240331.xsd#skin_DebtInstrumentAccordionFeatureIncreaseLimit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_skin_DebtInstrumentAccordionFeatureIncreaseLimit_5a358206-fe6a-451d-ba4c-1b131f910ae5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_dc8ff8ae-7797-4ff6-a688-76b08aff236b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_dc8ff8ae-7797-4ff6-a688-76b08aff236b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_75c067d2-7f44-4e8b-8763-6aa0d1bbc5dc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentRedemptionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_us-gaap_DebtInstrumentRedemptionPricePercentage_75c067d2-7f44-4e8b-8763-6aa0d1bbc5dc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfConvertibleDebt_0bcedf35-38cc-4787-8b61-b5ba14687a47" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfConvertibleDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_us-gaap_RepaymentsOfConvertibleDebt_0bcedf35-38cc-4787-8b61-b5ba14687a47" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_2a99660c-07fd-4690-b2d1-39e21c589e70" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_2a99660c-07fd-4690-b2d1-39e21c589e70" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_a5df135d-22ef-490b-9457-f442cc20d7b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_WriteOffOfDeferredDebtIssuanceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_us-gaap_WriteOffOfDeferredDebtIssuanceCost_a5df135d-22ef-490b-9457-f442cc20d7b9" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtFairValueDisclosures_73cd022a-6e75-4941-a6be-da26cbd5c840" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtFairValueDisclosures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_us-gaap_ConvertibleDebtFairValueDisclosures_73cd022a-6e75-4941-a6be-da26cbd5c840" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_OptionIndexedToIssuersEquityCapPrice_03e68c9b-14d3-4838-bcde-43d22a4dcd81" xlink:href="skin-20240331.xsd#skin_OptionIndexedToIssuersEquityCapPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_skin_OptionIndexedToIssuersEquityCapPrice_03e68c9b-14d3-4838-bcde-43d22a4dcd81" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_OptionIndexedToIssuersEquityPremium_0868d963-cbc5-4788-b7ae-af3901409af2" xlink:href="skin-20240331.xsd#skin_OptionIndexedToIssuersEquityPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_skin_OptionIndexedToIssuersEquityPremium_0868d963-cbc5-4788-b7ae-af3901409af2" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_AdjustmentsToAdditionalPaidInCapitalOptionIndexedToIssuersEquity_c745f326-0ed6-4d64-bd94-d0d32566c43a" xlink:href="skin-20240331.xsd#skin_AdjustmentsToAdditionalPaidInCapitalOptionIndexedToIssuersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3233aa04-e537-4ded-b9d5-d0d6a47af406" xlink:to="loc_skin_AdjustmentsToAdditionalPaidInCapitalOptionIndexedToIssuersEquity_c745f326-0ed6-4d64-bd94-d0d32566c43a" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/LongtermDebtScheduleofLongtermDebtDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#LongtermDebtScheduleofLongtermDebtDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/LongtermDebtScheduleofLongtermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_df6a140c-d87e-454f-b317-759f9ee64839" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_3bbe8603-c467-40d7-9349-d5e5ee0df1db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_df6a140c-d87e-454f-b317-759f9ee64839" xlink:to="loc_us-gaap_DebtInstrumentTable_3bbe8603-c467-40d7-9349-d5e5ee0df1db" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_01c4d3b9-3992-47d3-88b5-36e942651fac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3bbe8603-c467-40d7-9349-d5e5ee0df1db" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_01c4d3b9-3992-47d3-88b5-36e942651fac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_01c4d3b9-3992-47d3-88b5-36e942651fac_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01c4d3b9-3992-47d3-88b5-36e942651fac" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_01c4d3b9-3992-47d3-88b5-36e942651fac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_99f035a2-deba-4ecd-8670-8256b2f9c92b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_01c4d3b9-3992-47d3-88b5-36e942651fac" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_99f035a2-deba-4ecd-8670-8256b2f9c92b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_ffa2cdf6-1eb4-4b47-8e26-4b57bbd4a992" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_99f035a2-deba-4ecd-8670-8256b2f9c92b" xlink:to="loc_us-gaap_ConvertibleDebtMember_ffa2cdf6-1eb4-4b47-8e26-4b57bbd4a992" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_a2bf7df0-8f4a-4ff6-b15b-c319c6937073" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_3bbe8603-c467-40d7-9349-d5e5ee0df1db" xlink:to="loc_us-gaap_DebtInstrumentAxis_a2bf7df0-8f4a-4ff6-b15b-c319c6937073" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a2bf7df0-8f4a-4ff6-b15b-c319c6937073_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_a2bf7df0-8f4a-4ff6-b15b-c319c6937073" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a2bf7df0-8f4a-4ff6-b15b-c319c6937073_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7fb85dc2-b4bd-4d15-9c25-7eed5d7fedd3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_a2bf7df0-8f4a-4ff6-b15b-c319c6937073" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7fb85dc2-b4bd-4d15-9c25-7eed5d7fedd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_A125ConvertibleSeniorNotesDue2026Member_9110de06-3928-4f11-9fd7-c60a115e6990" xlink:href="skin-20240331.xsd#skin_A125ConvertibleSeniorNotesDue2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_7fb85dc2-b4bd-4d15-9c25-7eed5d7fedd3" xlink:to="loc_skin_A125ConvertibleSeniorNotesDue2026Member_9110de06-3928-4f11-9fd7-c60a115e6990" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c617b2cb-08d0-4bb2-be44-768ceaee2651" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_df6a140c-d87e-454f-b317-759f9ee64839" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_c617b2cb-08d0-4bb2-be44-768ceaee2651" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_fd9cea84-0ef1-448a-9633-54326f13c0c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_df6a140c-d87e-454f-b317-759f9ee64839" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_fd9cea84-0ef1-448a-9633-54326f13c0c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_8d72e7ab-07fb-4512-aa36-38fd5bf81144" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_df6a140c-d87e-454f-b317-759f9ee64839" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_8d72e7ab-07fb-4512-aa36-38fd5bf81144" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_3f87c950-ce24-4516-aad4-2ddc8813b224" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_df6a140c-d87e-454f-b317-759f9ee64839" xlink:to="loc_us-gaap_LongTermDebt_3f87c950-ce24-4516-aad4-2ddc8813b224" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/ShareBasedCompensationScheduleofstockbasedcompensationexpenseDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#ShareBasedCompensationScheduleofstockbasedcompensationexpenseDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/ShareBasedCompensationScheduleofstockbasedcompensationexpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_7e858306-e7f7-4f0d-ac39-af5c7eba35fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_8d1c8d51-e9eb-4741-a450-8dbbc7bd72f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_7e858306-e7f7-4f0d-ac39-af5c7eba35fe" xlink:to="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_8d1c8d51-e9eb-4741-a450-8dbbc7bd72f9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_fc5ad891-19e7-4363-adf3-5b8b09558460" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_8d1c8d51-e9eb-4741-a450-8dbbc7bd72f9" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_fc5ad891-19e7-4363-adf3-5b8b09558460" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_fc5ad891-19e7-4363-adf3-5b8b09558460_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_fc5ad891-19e7-4363-adf3-5b8b09558460" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_fc5ad891-19e7-4363-adf3-5b8b09558460_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_84bca1f2-f184-4f33-9b82-7859f8f4fc64" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_fc5ad891-19e7-4363-adf3-5b8b09558460" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_84bca1f2-f184-4f33-9b82-7859f8f4fc64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_2ac4dc92-59f1-4740-8b58-566b3d6ef07d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_84bca1f2-f184-4f33-9b82-7859f8f4fc64" xlink:to="loc_us-gaap_CostOfSalesMember_2ac4dc92-59f1-4740-8b58-566b3d6ef07d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingAndMarketingExpenseMember_462006dc-f9b5-4b1e-b860-09b117406ab7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingAndMarketingExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_84bca1f2-f184-4f33-9b82-7859f8f4fc64" xlink:to="loc_us-gaap_SellingAndMarketingExpenseMember_462006dc-f9b5-4b1e-b860-09b117406ab7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_4a475eda-3078-4f78-8d09-7546129e7c76" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_84bca1f2-f184-4f33-9b82-7859f8f4fc64" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_4a475eda-3078-4f78-8d09-7546129e7c76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpenseMember_4181049e-fa13-4684-a24c-f6fef2080df0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GeneralAndAdministrativeExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_84bca1f2-f184-4f33-9b82-7859f8f4fc64" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpenseMember_4181049e-fa13-4684-a24c-f6fef2080df0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_7c96dd5b-9974-4c9d-8f40-a4fa0522f862" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_7e858306-e7f7-4f0d-ac39-af5c7eba35fe" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_7c96dd5b-9974-4c9d-8f40-a4fa0522f862" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/ShareBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#ShareBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/ShareBasedCompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_abfe29cd-88df-46e9-b170-e4bc8dc3ee8e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_eef37aec-f64a-45f7-b474-78d4e626197a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_abfe29cd-88df-46e9-b170-e4bc8dc3ee8e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_eef37aec-f64a-45f7-b474-78d4e626197a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_98aaa47e-a7bc-4d02-9832-03754848ff3a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_eef37aec-f64a-45f7-b474-78d4e626197a" xlink:to="loc_us-gaap_AwardTypeAxis_98aaa47e-a7bc-4d02-9832-03754848ff3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_98aaa47e-a7bc-4d02-9832-03754848ff3a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_98aaa47e-a7bc-4d02-9832-03754848ff3a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_98aaa47e-a7bc-4d02-9832-03754848ff3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_73141545-a2b6-4c09-ac2e-29bd24cda8a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_98aaa47e-a7bc-4d02-9832-03754848ff3a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_73141545-a2b6-4c09-ac2e-29bd24cda8a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_acdc84be-4a18-4449-9f18-ef8e88e360fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_73141545-a2b6-4c09-ac2e-29bd24cda8a1" xlink:to="loc_us-gaap_EmployeeStockMember_acdc84be-4a18-4449-9f18-ef8e88e360fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_acd71232-a78a-4bba-b2eb-c7880cd9f6b1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_eef37aec-f64a-45f7-b474-78d4e626197a" xlink:to="loc_us-gaap_PlanNameAxis_acd71232-a78a-4bba-b2eb-c7880cd9f6b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_acd71232-a78a-4bba-b2eb-c7880cd9f6b1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_acd71232-a78a-4bba-b2eb-c7880cd9f6b1" xlink:to="loc_us-gaap_PlanNameDomain_acd71232-a78a-4bba-b2eb-c7880cd9f6b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_a301deb3-a2d2-4d64-ba2a-ce149c6cc64b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_acd71232-a78a-4bba-b2eb-c7880cd9f6b1" xlink:to="loc_us-gaap_PlanNameDomain_a301deb3-a2d2-4d64-ba2a-ce149c6cc64b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_A2021EmployeeStockPurchasePlanMember_687deb67-ade1-4017-a4bc-f43b9121f33f" xlink:href="skin-20240331.xsd#skin_A2021EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_a301deb3-a2d2-4d64-ba2a-ce149c6cc64b" xlink:to="loc_skin_A2021EmployeeStockPurchasePlanMember_687deb67-ade1-4017-a4bc-f43b9121f33f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_325fba36-9d48-4917-819f-e855428e0ee7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_abfe29cd-88df-46e9-b170-e4bc8dc3ee8e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_325fba36-9d48-4917-819f-e855428e0ee7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_10e587d7-33ae-4e62-ac5f-f5d3ef7ae732" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_abfe29cd-88df-46e9-b170-e4bc8dc3ee8e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_10e587d7-33ae-4e62-ac5f-f5d3ef7ae732" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_5303011a-0ef3-4f41-858b-204a04bf29f6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_abfe29cd-88df-46e9-b170-e4bc8dc3ee8e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_5303011a-0ef3-4f41-858b-204a04bf29f6" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/CommitmentsandContingenciesDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#CommitmentsandContingenciesDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/CommitmentsandContingenciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_303166a5-6706-42c2-9003-0b59c09b152c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_efe435e2-197f-418b-b91b-4bfc650c13a6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_303166a5-6706-42c2-9003-0b59c09b152c" xlink:to="loc_us-gaap_LossContingenciesTable_efe435e2-197f-418b-b91b-4bfc650c13a6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_a0f314d8-0e70-49a7-8d8b-06ac0a5d203e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_efe435e2-197f-418b-b91b-4bfc650c13a6" xlink:to="loc_srt_LitigationCaseAxis_a0f314d8-0e70-49a7-8d8b-06ac0a5d203e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_a0f314d8-0e70-49a7-8d8b-06ac0a5d203e_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_a0f314d8-0e70-49a7-8d8b-06ac0a5d203e" xlink:to="loc_srt_LitigationCaseTypeDomain_a0f314d8-0e70-49a7-8d8b-06ac0a5d203e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_84c60641-941d-447e-991a-f5612c1b9322" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_a0f314d8-0e70-49a7-8d8b-06ac0a5d203e" xlink:to="loc_srt_LitigationCaseTypeDomain_84c60641-941d-447e-991a-f5612c1b9322" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_EdgeSystemsLLCVAgelessSerumsLLCMember_88b15f2e-5449-4971-95e1-65a2baeb218b" xlink:href="skin-20240331.xsd#skin_EdgeSystemsLLCVAgelessSerumsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_84c60641-941d-447e-991a-f5612c1b9322" xlink:to="loc_skin_EdgeSystemsLLCVAgelessSerumsLLCMember_88b15f2e-5449-4971-95e1-65a2baeb218b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_EdgeSystemsLLCVCartessaAestheticsLLCMember_9e2d0314-97f2-4d9c-9f9f-1ac0cc331bdb" xlink:href="skin-20240331.xsd#skin_EdgeSystemsLLCVCartessaAestheticsLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_84c60641-941d-447e-991a-f5612c1b9322" xlink:to="loc_skin_EdgeSystemsLLCVCartessaAestheticsLLCMember_9e2d0314-97f2-4d9c-9f9f-1ac0cc331bdb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNewClaimsFiledNumber_676f0272-81be-478d-8ca8-3d68401fb83f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingencyNewClaimsFiledNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_303166a5-6706-42c2-9003-0b59c09b152c" xlink:to="loc_us-gaap_LossContingencyNewClaimsFiledNumber_676f0272-81be-478d-8ca8-3d68401fb83f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_LitigationSettlementAmountAwardedFromOtherPartyQuarterlyPaymentAmount_8f3a9f4e-15c8-4464-aa08-76f72f8efa48" xlink:href="skin-20240331.xsd#skin_LitigationSettlementAmountAwardedFromOtherPartyQuarterlyPaymentAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_303166a5-6706-42c2-9003-0b59c09b152c" xlink:to="loc_skin_LitigationSettlementAmountAwardedFromOtherPartyQuarterlyPaymentAmount_8f3a9f4e-15c8-4464-aa08-76f72f8efa48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_NumberOfQuarterlyPayments_23575d65-8855-4e01-bf29-04222ad4e59c" xlink:href="skin-20240331.xsd#skin_NumberOfQuarterlyPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_303166a5-6706-42c2-9003-0b59c09b152c" xlink:to="loc_skin_NumberOfQuarterlyPayments_23575d65-8855-4e01-bf29-04222ad4e59c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedFromOtherParty_a76fa58d-310d-4163-9a71-2f6bfc31d0a8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LitigationSettlementAmountAwardedFromOtherParty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_303166a5-6706-42c2-9003-0b59c09b152c" xlink:to="loc_us-gaap_LitigationSettlementAmountAwardedFromOtherParty_a76fa58d-310d-4163-9a71-2f6bfc31d0a8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromLegalSettlements_fba01bb9-f449-4726-a1f4-3f9857ba36d2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromLegalSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_303166a5-6706-42c2-9003-0b59c09b152c" xlink:to="loc_us-gaap_ProceedsFromLegalSettlements_fba01bb9-f449-4726-a1f4-3f9857ba36d2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_LossContingencyNewClaimsRevisedNumber_e5189dee-9522-4dca-a044-04f18274c7a2" xlink:href="skin-20240331.xsd#skin_LossContingencyNewClaimsRevisedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_303166a5-6706-42c2-9003-0b59c09b152c" xlink:to="loc_skin_LossContingencyNewClaimsRevisedNumber_e5189dee-9522-4dca-a044-04f18274c7a2" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/RelatedPartyTransactionsDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#RelatedPartyTransactionsDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/RelatedPartyTransactionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_735b7ef9-efe9-4a74-bb8d-16b2d7148be7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_735b7ef9-efe9-4a74-bb8d-16b2d7148be7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_181366eb-1bbb-477e-a9bb-8a2521666647" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_735b7ef9-efe9-4a74-bb8d-16b2d7148be7" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_181366eb-1bbb-477e-a9bb-8a2521666647" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_181366eb-1bbb-477e-a9bb-8a2521666647_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_181366eb-1bbb-477e-a9bb-8a2521666647" xlink:to="loc_us-gaap_RelatedPartyDomain_181366eb-1bbb-477e-a9bb-8a2521666647_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_08624617-a593-4fcd-8e08-94a32bf61649" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_181366eb-1bbb-477e-a9bb-8a2521666647" xlink:to="loc_us-gaap_RelatedPartyDomain_08624617-a593-4fcd-8e08-94a32bf61649" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_989fd104-fa40-439b-b75f-b94026ffdaaa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_08624617-a593-4fcd-8e08-94a32bf61649" xlink:to="loc_us-gaap_RelatedPartyMember_989fd104-fa40-439b-b75f-b94026ffdaaa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_88eca919-615c-477f-93ce-303b889b14a0" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_735b7ef9-efe9-4a74-bb8d-16b2d7148be7" xlink:to="loc_srt_CounterpartyNameAxis_88eca919-615c-477f-93ce-303b889b14a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_88eca919-615c-477f-93ce-303b889b14a0_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_88eca919-615c-477f-93ce-303b889b14a0" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_88eca919-615c-477f-93ce-303b889b14a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_b09dc33c-1e86-4518-b74a-44b0be2e8e6e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_88eca919-615c-477f-93ce-303b889b14a0" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_b09dc33c-1e86-4518-b74a-44b0be2e8e6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_VesperFoundersMember_03368def-3c6c-42c2-829d-15693f239c7e" xlink:href="skin-20240331.xsd#skin_VesperFoundersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_b09dc33c-1e86-4518-b74a-44b0be2e8e6e" xlink:to="loc_skin_VesperFoundersMember_03368def-3c6c-42c2-829d-15693f239c7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_LCPEdgeHoldcoLLCMember_60c69b97-188c-4c39-89b8-f00908abf332" xlink:href="skin-20240331.xsd#skin_LCPEdgeHoldcoLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_b09dc33c-1e86-4518-b74a-44b0be2e8e6e" xlink:to="loc_skin_LCPEdgeHoldcoLLCMember_60c69b97-188c-4c39-89b8-f00908abf332" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightAxis_ffe3a876-adc7-4677-a40f-78444eac1750" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRelatedPartyTransactionsByRelatedPartyTable_735b7ef9-efe9-4a74-bb8d-16b2d7148be7" xlink:to="loc_us-gaap_ClassOfWarrantOrRightAxis_ffe3a876-adc7-4677-a40f-78444eac1750" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_ffe3a876-adc7-4677-a40f-78444eac1750_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_ffe3a876-adc7-4677-a40f-78444eac1750" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_ffe3a876-adc7-4677-a40f-78444eac1750_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfWarrantOrRightDomain_a10686ec-bfd4-4004-9e85-a4e4a54f1be1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfWarrantOrRightDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ClassOfWarrantOrRightAxis_ffe3a876-adc7-4677-a40f-78444eac1750" xlink:to="loc_us-gaap_ClassOfWarrantOrRightDomain_a10686ec-bfd4-4004-9e85-a4e4a54f1be1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_PrivatePlacementWarrantsMember_423de377-3231-47c3-a1f0-0921fb9b9a19" xlink:href="skin-20240331.xsd#skin_PrivatePlacementWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfWarrantOrRightDomain_a10686ec-bfd4-4004-9e85-a4e4a54f1be1" xlink:to="loc_skin_PrivatePlacementWarrantsMember_423de377-3231-47c3-a1f0-0921fb9b9a19" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_5b1e05ea-5724-4886-9af4-44357275cecb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities_5b1e05ea-5724-4886-9af4-44357275cecb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_TheRegistrationRightsAgreementFilingTimeline_64b2ec18-5fc6-456b-84ac-668c39f5a8da" xlink:href="skin-20240331.xsd#skin_TheRegistrationRightsAgreementFilingTimeline"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_skin_TheRegistrationRightsAgreementFilingTimeline_64b2ec18-5fc6-456b-84ac-668c39f5a8da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_TheRegistrationRightsAgreementNumberOfDemandsForRegistrationAllowed_19500ca8-b7e2-4ca5-87e8-f385ff12884f" xlink:href="skin-20240331.xsd#skin_TheRegistrationRightsAgreementNumberOfDemandsForRegistrationAllowed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_skin_TheRegistrationRightsAgreementNumberOfDemandsForRegistrationAllowed_19500ca8-b7e2-4ca5-87e8-f385ff12884f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriod_8cf8d853-2aaa-481e-aedb-1afb3221add7" xlink:href="skin-20240331.xsd#skin_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_skin_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriod_8cf8d853-2aaa-481e-aedb-1afb3221add7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodStockPriceTrigger_3ce27bf5-9b6a-4494-afd8-4971322a18bd" xlink:href="skin-20240331.xsd#skin_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodStockPriceTrigger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_skin_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodStockPriceTrigger_3ce27bf5-9b6a-4494-afd8-4971322a18bd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodThresholdBusinessDays_8c8d27ff-b9bc-42db-a477-a1413b7c35c7" xlink:href="skin-20240331.xsd#skin_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodThresholdBusinessDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_skin_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodThresholdBusinessDays_8c8d27ff-b9bc-42db-a477-a1413b7c35c7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodThresholdConsecutiveTradingDays_066f3c94-c820-4937-846c-cf1e744b0426" xlink:href="skin-20240331.xsd#skin_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodThresholdConsecutiveTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_skin_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodThresholdConsecutiveTradingDays_066f3c94-c820-4937-846c-cf1e744b0426" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_ReverseRecapitalizationContingentConsiderationEquityCommencementPeriod_087999ec-f21d-475a-bf2e-02827237de8c" xlink:href="skin-20240331.xsd#skin_ReverseRecapitalizationContingentConsiderationEquityCommencementPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_skin_ReverseRecapitalizationContingentConsiderationEquityCommencementPeriod_087999ec-f21d-475a-bf2e-02827237de8c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_ReverseRecapitalizationRightToDesignateDirectorsPercentageThresholdOneDirector_409adce9-36b4-4e1a-be61-7c4e2735dcf5" xlink:href="skin-20240331.xsd#skin_ReverseRecapitalizationRightToDesignateDirectorsPercentageThresholdOneDirector"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_skin_ReverseRecapitalizationRightToDesignateDirectorsPercentageThresholdOneDirector_409adce9-36b4-4e1a-be61-7c4e2735dcf5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_ReverseRecapitalizationRightToDesignateDirectorsPercentageThresholdTwoDirectors_70fc6584-a9e4-4bbf-951d-93fed79b46af" xlink:href="skin-20240331.xsd#skin_ReverseRecapitalizationRightToDesignateDirectorsPercentageThresholdTwoDirectors"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_skin_ReverseRecapitalizationRightToDesignateDirectorsPercentageThresholdTwoDirectors_70fc6584-a9e4-4bbf-951d-93fed79b46af" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_ReverseRecapitalizationRightToDesignateDirectorsPercentageThresholdThreeDirectors_6e80a0a5-1c94-43db-bd50-74df737228f3" xlink:href="skin-20240331.xsd#skin_ReverseRecapitalizationRightToDesignateDirectorsPercentageThresholdThreeDirectors"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_skin_ReverseRecapitalizationRightToDesignateDirectorsPercentageThresholdThreeDirectors_6e80a0a5-1c94-43db-bd50-74df737228f3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_ReverseRecapitalizationRightToDesignateOneDirectorOnBoardPercentageThreshold_ab4faa58-d215-493b-88b3-3aafc68e61d9" xlink:href="skin-20240331.xsd#skin_ReverseRecapitalizationRightToDesignateOneDirectorOnBoardPercentageThreshold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionLineItems_69c776f7-27ec-403c-9516-6c03b13a7893" xlink:to="loc_skin_ReverseRecapitalizationRightToDesignateOneDirectorOnBoardPercentageThreshold_ab4faa58-d215-493b-88b3-3aafc68e61d9" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/StockholdersEquityDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#StockholdersEquityDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/StockholdersEquityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfStockByClassTable_8fb2c73e-a66b-429d-ad5d-d45b61d72a17" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfStockByClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_us-gaap_ScheduleOfStockByClassTable_8fb2c73e-a66b-429d-ad5d-d45b61d72a17" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_ac191e85-8a28-4c00-95c2-f94b8f1a35a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfStockByClassTable_8fb2c73e-a66b-429d-ad5d-d45b61d72a17" xlink:to="loc_us-gaap_StatementClassOfStockAxis_ac191e85-8a28-4c00-95c2-f94b8f1a35a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_ac191e85-8a28-4c00-95c2-f94b8f1a35a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_ac191e85-8a28-4c00-95c2-f94b8f1a35a2" xlink:to="loc_us-gaap_ClassOfStockDomain_ac191e85-8a28-4c00-95c2-f94b8f1a35a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_c1c8dc23-b1a6-4092-876e-436aa99a3b29" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_ac191e85-8a28-4c00-95c2-f94b8f1a35a2" xlink:to="loc_us-gaap_ClassOfStockDomain_c1c8dc23-b1a6-4092-876e-436aa99a3b29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_5803a57f-4405-4a40-ac31-03d079af8576" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonClassAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_c1c8dc23-b1a6-4092-876e-436aa99a3b29" xlink:to="loc_us-gaap_CommonClassAMember_5803a57f-4405-4a40-ac31-03d079af8576" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_3236e74c-cf2c-43b9-8265-4b86d82bae8a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_3236e74c-cf2c-43b9-8265-4b86d82bae8a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_3c32185d-df0d-4e18-b8d6-a8a7afa861be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_3c32185d-df0d-4e18-b8d6-a8a7afa861be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_CommonStockVotingRightsVotes_c80c6afd-56ba-4b0a-81b4-ac15e77c69ae" xlink:href="skin-20240331.xsd#skin_CommonStockVotingRightsVotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_skin_CommonStockVotingRightsVotes_c80c6afd-56ba-4b0a-81b4-ac15e77c69ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_4f7ff853-e968-4bdb-ad88-de13fd58b988" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_4f7ff853-e968-4bdb-ad88-de13fd58b988" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_898097e3-2f25-49c3-a91e-74d281ca5334" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_us-gaap_CommonStockSharesIssued_898097e3-2f25-49c3-a91e-74d281ca5334" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_2b707e9b-a461-4348-854c-2589f83021cf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_2b707e9b-a461-4348-854c-2589f83021cf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_34877617-cc0a-4f61-9a32-66851f152faf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodShares_34877617-cc0a-4f61-9a32-66851f152faf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_9a5910da-c358-45c4-82ae-1e3961b7246f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchasedAndRetiredDuringPeriodValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_us-gaap_StockRepurchasedAndRetiredDuringPeriodValue_9a5910da-c358-45c4-82ae-1e3961b7246f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_012c380b-aac7-410d-aef1-8c22ac58c9cc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_012c380b-aac7-410d-aef1-8c22ac58c9cc" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_44400103-aa53-4108-9ce8-bf81be86d6bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_44400103-aa53-4108-9ce8-bf81be86d6bb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_0e815423-170d-4463-8af8-fde89649404e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_us-gaap_PreferredStockSharesIssued_0e815423-170d-4463-8af8-fde89649404e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_a5d969de-e58e-44a8-8240-413ab23104dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockLineItems_d974b14e-7c89-48f4-9f9d-31782a9ff651" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_a5d969de-e58e-44a8-8240-413ab23104dd" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/NetLossAttributabletoCommonStockholdersScheduleofantidilutivesecuritiesexcludedfromearningspersharecomputationDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#NetLossAttributabletoCommonStockholdersScheduleofantidilutivesecuritiesexcludedfromearningspersharecomputationDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/NetLossAttributabletoCommonStockholdersScheduleofantidilutivesecuritiesexcludedfromearningspersharecomputationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_7fc086ef-b952-4d20-8037-fbbc25b45792" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_f33424bf-e759-4e90-803f-0b3ff1887cc6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_7fc086ef-b952-4d20-8037-fbbc25b45792" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_f33424bf-e759-4e90-803f-0b3ff1887cc6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_ac2e3301-2d20-4eda-8b3f-aaff72db865b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_f33424bf-e759-4e90-803f-0b3ff1887cc6" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_ac2e3301-2d20-4eda-8b3f-aaff72db865b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ac2e3301-2d20-4eda-8b3f-aaff72db865b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_ac2e3301-2d20-4eda-8b3f-aaff72db865b" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_ac2e3301-2d20-4eda-8b3f-aaff72db865b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_f0867e80-3303-474b-b8b7-3c0befd6cc8b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_ac2e3301-2d20-4eda-8b3f-aaff72db865b" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_f0867e80-3303-474b-b8b7-3c0befd6cc8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtSecuritiesMember_be1dca84-e781-48c0-922f-b38264f2ab08" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_f0867e80-3303-474b-b8b7-3c0befd6cc8b" xlink:to="loc_us-gaap_ConvertibleDebtSecuritiesMember_be1dca84-e781-48c0-922f-b38264f2ab08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_e7e02e98-c28b-45ff-b130-99b238ad4e10" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_f0867e80-3303-474b-b8b7-3c0befd6cc8b" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_e7e02e98-c28b-45ff-b130-99b238ad4e10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_1edcc69c-a3c5-4fa7-afd7-42d7727abc0a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_f0867e80-3303-474b-b8b7-3c0befd6cc8b" xlink:to="loc_us-gaap_EmployeeStockOptionMember_1edcc69c-a3c5-4fa7-afd7-42d7727abc0a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_409ab5d6-ee0b-47fd-830d-2e0e1cb953e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PerformanceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_f0867e80-3303-474b-b8b7-3c0befd6cc8b" xlink:to="loc_us-gaap_PerformanceSharesMember_409ab5d6-ee0b-47fd-830d-2e0e1cb953e4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_0a0ce9ab-b246-449a-a42e-5ae0a68a1942" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_7fc086ef-b952-4d20-8037-fbbc25b45792" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_0a0ce9ab-b246-449a-a42e-5ae0a68a1942" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/SyndeoProgramDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#SyndeoProgramDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/SyndeoProgramDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_3eba3cff-ce08-4c73-b6c6-51647482cada" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_356ac42a-2d89-4d7a-b0e8-6a8e65e15904" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_3eba3cff-ce08-4c73-b6c6-51647482cada" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_356ac42a-2d89-4d7a-b0e8-6a8e65e15904" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_7cd697aa-03b8-4950-a27f-a4768c576c75" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_356ac42a-2d89-4d7a-b0e8-6a8e65e15904" xlink:to="loc_us-gaap_RestructuringPlanAxis_7cd697aa-03b8-4950-a27f-a4768c576c75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_7cd697aa-03b8-4950-a27f-a4768c576c75_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_7cd697aa-03b8-4950-a27f-a4768c576c75" xlink:to="loc_us-gaap_RestructuringPlanDomain_7cd697aa-03b8-4950-a27f-a4768c576c75_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_2af326d3-f89f-4319-9a14-0609b66e5d0c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_7cd697aa-03b8-4950-a27f-a4768c576c75" xlink:to="loc_us-gaap_RestructuringPlanDomain_2af326d3-f89f-4319-9a14-0609b66e5d0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_SyndeoProgramMember_2c20eb8f-c3f7-4d76-b9bb-f19f489b864f" xlink:href="skin-20240331.xsd#skin_SyndeoProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_2af326d3-f89f-4319-9a14-0609b66e5d0c" xlink:to="loc_skin_SyndeoProgramMember_2c20eb8f-c3f7-4d76-b9bb-f19f489b864f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_SyndeoProgramWarrantyExtensionPeriod_bcc4b45a-d9b3-4f40-8dbe-7857347b9cbd" xlink:href="skin-20240331.xsd#skin_SyndeoProgramWarrantyExtensionPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_3eba3cff-ce08-4c73-b6c6-51647482cada" xlink:to="loc_skin_SyndeoProgramWarrantyExtensionPeriod_bcc4b45a-d9b3-4f40-8dbe-7857347b9cbd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_skin_SyndeoProgramReserves_446fb7fb-75a8-44ca-8865-bf476808ddbd" xlink:href="skin-20240331.xsd#skin_SyndeoProgramReserves"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_3eba3cff-ce08-4c73-b6c6-51647482cada" xlink:to="loc_skin_SyndeoProgramReserves_446fb7fb-75a8-44ca-8865-bf476808ddbd" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/RevisionforImmaterialMisstatementsNarrativeDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#RevisionforImmaterialMisstatementsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/RevisionforImmaterialMisstatementsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_9c5ebb2d-4c9a-4821-9f44-a503053f7b2c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_3fe3cf23-7e21-48b7-bb3b-fb1579aa4d8d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_9c5ebb2d-4c9a-4821-9f44-a503053f7b2c" xlink:to="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_3fe3cf23-7e21-48b7-bb3b-fb1579aa4d8d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_dd3c054e-af08-4c56-a3c8-06a8aa230cf1" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_3fe3cf23-7e21-48b7-bb3b-fb1579aa4d8d" xlink:to="loc_srt_RestatementAxis_dd3c054e-af08-4c56-a3c8-06a8aa230cf1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_dd3c054e-af08-4c56-a3c8-06a8aa230cf1_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_dd3c054e-af08-4c56-a3c8-06a8aa230cf1" xlink:to="loc_srt_RestatementDomain_dd3c054e-af08-4c56-a3c8-06a8aa230cf1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_38fc4fd8-d2fd-4fe5-b4c3-bb176d50e453" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_dd3c054e-af08-4c56-a3c8-06a8aa230cf1" xlink:to="loc_srt_RestatementDomain_38fc4fd8-d2fd-4fe5-b4c3-bb176d50e453" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAdjustmentMember_60993e63-d16e-4bd4-b597-5a1b3a45a988" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_38fc4fd8-d2fd-4fe5-b4c3-bb176d50e453" xlink:to="loc_srt_RestatementAdjustmentMember_60993e63-d16e-4bd4-b597-5a1b3a45a988" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_930540e9-6789-4289-8f88-a02a4146631a" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioPreviouslyReportedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_38fc4fd8-d2fd-4fe5-b4c3-bb176d50e453" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_930540e9-6789-4289-8f88-a02a4146631a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_df28a64d-7308-48b4-88f5-c41681359baf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_9c5ebb2d-4c9a-4821-9f44-a503053f7b2c" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_df28a64d-7308-48b4-88f5-c41681359baf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_40905779-dd43-45b8-b9f8-9d1c8c8e5955" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_9c5ebb2d-4c9a-4821-9f44-a503053f7b2c" xlink:to="loc_us-gaap_StockholdersEquity_40905779-dd43-45b8-b9f8-9d1c8c8e5955" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/RevisionforImmaterialMisstatementsConsolidatedStatementofComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#RevisionforImmaterialMisstatementsConsolidatedStatementofComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/RevisionforImmaterialMisstatementsConsolidatedStatementofComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_cbd21737-dde3-4675-a522-29683177cba5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_2838c093-d51f-45df-a286-e54a28ec623b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_cbd21737-dde3-4675-a522-29683177cba5" xlink:to="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_2838c093-d51f-45df-a286-e54a28ec623b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_45bba25a-ff95-4103-a709-10662c8cbe79" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_2838c093-d51f-45df-a286-e54a28ec623b" xlink:to="loc_srt_RestatementAxis_45bba25a-ff95-4103-a709-10662c8cbe79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_45bba25a-ff95-4103-a709-10662c8cbe79_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_45bba25a-ff95-4103-a709-10662c8cbe79" xlink:to="loc_srt_RestatementDomain_45bba25a-ff95-4103-a709-10662c8cbe79_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_83ae66bd-9dda-41bd-8542-7ac5e8eb593e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_45bba25a-ff95-4103-a709-10662c8cbe79" xlink:to="loc_srt_RestatementDomain_83ae66bd-9dda-41bd-8542-7ac5e8eb593e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_7a53c14f-b574-4805-9ba6-555882e715d2" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioPreviouslyReportedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_83ae66bd-9dda-41bd-8542-7ac5e8eb593e" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_7a53c14f-b574-4805-9ba6-555882e715d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAdjustmentMember_4f3fb181-6dd5-47fb-b061-28e20cff6c18" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_83ae66bd-9dda-41bd-8542-7ac5e8eb593e" xlink:to="loc_srt_RestatementAdjustmentMember_4f3fb181-6dd5-47fb-b061-28e20cff6c18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_96cd436b-872c-4d22-8bf9-b2fa3e4990f1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_cbd21737-dde3-4675-a522-29683177cba5" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_96cd436b-872c-4d22-8bf9-b2fa3e4990f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_fbc79b9e-b86f-4d6d-ac69-511e6eddc1bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_cbd21737-dde3-4675-a522-29683177cba5" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_fbc79b9e-b86f-4d6d-ac69-511e6eddc1bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_7ce4e32c-396c-4578-a332-69bfd15d95d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_cbd21737-dde3-4675-a522-29683177cba5" xlink:to="loc_us-gaap_NetIncomeLoss_7ce4e32c-396c-4578-a332-69bfd15d95d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_5278dfb5-244e-4c6c-a133-85ade5302cb2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_cbd21737-dde3-4675-a522-29683177cba5" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_5278dfb5-244e-4c6c-a133-85ade5302cb2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_e04c6717-55a0-44a2-b35b-cdb3f1e00bd3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_cbd21737-dde3-4675-a522-29683177cba5" xlink:to="loc_us-gaap_EarningsPerShareBasic_e04c6717-55a0-44a2-b35b-cdb3f1e00bd3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_399e2e6c-326c-45ba-86b8-4dc674d95272" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_cbd21737-dde3-4675-a522-29683177cba5" xlink:to="loc_us-gaap_EarningsPerShareDiluted_399e2e6c-326c-45ba-86b8-4dc674d95272" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hydrafacial.com/role/RevisionforImmaterialMisstatementsConsolidatedStatementofCashFlowsDetails" xlink:type="simple" xlink:href="skin-20240331.xsd#RevisionforImmaterialMisstatementsConsolidatedStatementofCashFlowsDetails"/>
  <link:definitionLink xlink:role="http://hydrafacial.com/role/RevisionforImmaterialMisstatementsConsolidatedStatementofCashFlowsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_e91ab7cc-8f17-40ae-a546-2a9744825e17" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_44f175b4-a44a-45cd-9997-a61823697725" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_e91ab7cc-8f17-40ae-a546-2a9744825e17" xlink:to="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_44f175b4-a44a-45cd-9997-a61823697725" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_bf27f5f0-85d0-49bc-9007-1a4f0b32dde0" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfErrorCorrectionsAndPriorPeriodAdjustmentRestatementTable_44f175b4-a44a-45cd-9997-a61823697725" xlink:to="loc_srt_RestatementAxis_bf27f5f0-85d0-49bc-9007-1a4f0b32dde0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_bf27f5f0-85d0-49bc-9007-1a4f0b32dde0_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_bf27f5f0-85d0-49bc-9007-1a4f0b32dde0" xlink:to="loc_srt_RestatementDomain_bf27f5f0-85d0-49bc-9007-1a4f0b32dde0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_f88684d5-f881-478a-9de8-cc09e09e6188" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_bf27f5f0-85d0-49bc-9007-1a4f0b32dde0" xlink:to="loc_srt_RestatementDomain_f88684d5-f881-478a-9de8-cc09e09e6188" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_3fcb3929-1d48-4658-a6bd-be9a280df4b3" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioPreviouslyReportedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_f88684d5-f881-478a-9de8-cc09e09e6188" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_3fcb3929-1d48-4658-a6bd-be9a280df4b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAdjustmentMember_4da576bd-4d23-42c0-9acd-2ad94e0ecce2" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RestatementAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_f88684d5-f881-478a-9de8-cc09e09e6188" xlink:to="loc_srt_RestatementAdjustmentMember_4da576bd-4d23-42c0-9acd-2ad94e0ecce2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_eed6a567-ba49-48ae-a586-e91cd288d631" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_e91ab7cc-8f17-40ae-a546-2a9744825e17" xlink:to="loc_us-gaap_NetIncomeLoss_eed6a567-ba49-48ae-a586-e91cd288d631" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_863717ba-23be-442a-9eb4-045aa5e7e0c4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_e91ab7cc-8f17-40ae-a546-2a9744825e17" xlink:to="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_863717ba-23be-442a-9eb4-045aa5e7e0c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_9846d1d8-7e9c-4aa2-8238-ea61a66242f8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherOperatingActivitiesCashFlowStatement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_863717ba-23be-442a-9eb4-045aa5e7e0c4" xlink:to="loc_us-gaap_OtherOperatingActivitiesCashFlowStatement_9846d1d8-7e9c-4aa2-8238-ea61a66242f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_0d242628-7b85-45c4-89d4-799e0c64044b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems_e91ab7cc-8f17-40ae-a546-2a9744825e17" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_0d242628-7b85-45c4-89d4-799e0c64044b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInInventories_c4af7f1c-4854-4d4b-90a6-c292f0cef2da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_0d242628-7b85-45c4-89d4-799e0c64044b" xlink:to="loc_us-gaap_IncreaseDecreaseInInventories_c4af7f1c-4854-4d4b-90a6-c292f0cef2da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_5de611bd-0127-4e81-9bc3-5ccac9f5573b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_0d242628-7b85-45c4-89d4-799e0c64044b" xlink:to="loc_us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets_5de611bd-0127-4e81-9bc3-5ccac9f5573b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_6643593a-5aff-4a2c-837f-b241f4c5b7d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_0d242628-7b85-45c4-89d4-799e0c64044b" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_6643593a-5aff-4a2c-837f-b241f4c5b7d9" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#AwardTypeOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_EmployeeStockMember" xlink:type="arc" order="4"/>
  </link:definitionLink>
</link:linkbase>
