diff --git a/microsetta_interface/implementation.py b/microsetta_interface/implementation.py
index bfa7a1c6..78efbfb3 100644
--- a/microsetta_interface/implementation.py
+++ b/microsetta_interface/implementation.py
@@ -124,6 +124,7 @@ class Source:
 VIOSCREEN_ID = 10001
 MYFOODREPO_ID = 10002
 POLYPHENOL_FFQ_ID = 10003
+SKIN_SCORING_APP_ID = 10005
 SPAIN_FFQ_ID = 10004
 
 SYSTEM_MSG_DICTIONARY = {
@@ -398,6 +399,21 @@ class Source:
         'est_minutes': '30',
         'icon': 'survey_external.svg'
     },
+    SKIN_SCORING_APP_ID: {
+        'description': 'This will direct you to the ModiFace skin-scoring web'
+                       ' app. This app allows you to upload a selfie photo, '
+                       'which will be used to generate anonymized data about '
+                       'your skin for researchers and provide you with what '
+                       'the algorithm assesses to be your top two skin '
+                       'concerns. You will be provided a username and study'
+                       ' code on the next screen to access the app, which '
+                       'will link your ModiFace results to your skin sample. '
+                       'This app is hosted by a third-party provider; we are '
+                       'unable to provide any assistance if you encounter '
+                       'errors or issues while using the app.',
+        'est_minutes': '5',
+        'icon': 'survey_external.svg'
+    },
 }
 LOCAL_SURVEY_SEQUENCE = [
     BASIC_INFO_ID,
@@ -466,7 +482,8 @@ def _get_req_survey_templates_by_source_type(source_type):
 
 def _get_opt_survey_templates_by_source_type(source_type):
     if source_type == Source.SOURCE_TYPE_HUMAN:
-        return [3, 4, 5, 7, MYFOODREPO_ID, POLYPHENOL_FFQ_ID, SPAIN_FFQ_ID]
+        return [3, 4, 5, 7, MYFOODREPO_ID, POLYPHENOL_FFQ_ID,
+                SPAIN_FFQ_ID, SKIN_SCORING_APP_ID]
     elif source_type == Source.SOURCE_TYPE_ANIMAL:
         return []
     elif source_type == Source.SOURCE_TYPE_ENVIRONMENT:
@@ -1398,6 +1415,14 @@ def get_fill_source_survey(*,
                 account_id, source_id, "data", reconsent=True
             )
 
+        # this is remote, so go to an external url, not our jinja2 template
+        return redirect(survey_output['survey_template_text']['url'])
+    elif survey_template_id == SKIN_SCORING_APP_ID:
+        if need_reconsent:
+            return render_consent_page(
+                account_id, source_id, "data", reconsent=True
+            )
+
         # this is remote, so go to an external url, not our jinja2 template
         return redirect(survey_output['survey_template_text']['url'])
     else:
@@ -1542,6 +1567,25 @@ def get_myfoodrepo_no_slots(*, account_id=None, source_id=None):
                                  source_id=source_id)
 
 
+@prerequisite([SOURCE_PREREQS_MET, BIOSPECIMEN_PREREQS_MET])
+def post_ajax_skin_scoring_app_credentials(*, account_id, source_id):
+    need_reconsent = check_current_consent(account_id, source_id, "data")
+
+    if need_reconsent:
+        return render_consent_page(
+            account_id, source_id, "data", reconsent=True
+        )
+
+    has_error, credentials, _ = ApiRequest.post(
+        "/accounts/%s/sources/%s/surveys/skin_scoring_app_credentials"
+        % (account_id, source_id)
+    )
+    if has_error == 404:
+        return flask.jsonify({"app_username": "", "app_studycode": ""})
+    else:
+        return flask.jsonify(credentials)
+
+
 @prerequisite([SOURCE_PREREQS_MET, BIOSPECIMEN_PREREQS_MET])
 def get_fill_vioscreen_remote_sample_survey(*,
                                             account_id=None,
@@ -1850,7 +1894,10 @@ def get_source(*, account_id=None, source_id=None):
     for answer in survey_answers:
         template_id = answer['survey_template_id']
         for template in local_surveys + remote_surveys:
-            if template['survey_template_id'] == template_id:
+            if template['survey_template_id'] == SKIN_SCORING_APP_ID:
+                template['survey_id'] = answer['survey_id']
+                template['answered'] = True
+            else:
                 template['answered'] = True
 
     for template in local_surveys:
@@ -1879,11 +1926,24 @@ def get_source(*, account_id=None, source_id=None):
         template['est_minutes'] = SURVEY_INFO[template_id]['est_minutes']
         template['icon'] = SURVEY_INFO[template_id]['icon']
 
-    # TODO: MyFoodRepo logic needs to be refactored when we reactivate it
-    """
     # any survey specific stuff like opening a tab
     # or slot checking
-    for idx, template in enumerate(remote_surveys[:]):
+    # NB: change "_" back to "idx" when MyFoodRepo is reactivated or if
+    # another external survey requires similar functionality
+    for _, template in enumerate(remote_surveys[:]):
+        if template['survey_template_id'] == SKIN_SCORING_APP_ID:
+            has_error, credentials, _ = ApiRequest.get(
+                '/accounts/%s/sources/%s/surveys/skin_scoring_app_credentials'
+                % (account_id, source_id)
+            )
+
+            if has_error:
+                return has_error
+
+            template['credentials'] = credentials
+
+        # TODO: MyFoodRepo logic needs to be refactored when we reactivate it
+        """
         if template['survey_template_id'] == MYFOODREPO_ID:
             has_error, slots, _ = ApiRequest.get('/slots/myfoodrepo')
             if has_error:
@@ -1896,7 +1956,7 @@ def get_source(*, account_id=None, source_id=None):
                 per_source_not_taken.pop(idx)
         else:
             template['new_tab'] = False
-    """
+        """
 
     local_surveys = [translate_survey_template(s) for s in local_surveys]
     remote_surveys = [translate_survey_template(s) for s in remote_surveys]
@@ -1911,7 +1971,8 @@ def get_source(*, account_id=None, source_id=None):
                                  source_name=source_output['source_name'],
                                  profile_has_samples=profile_has_samples,
                                  need_reconsent=need_reconsent,
-                                 show_update_age=show_update_age
+                                 show_update_age=show_update_age,
+                                 SKIN_SCORING_APP_ID=SKIN_SCORING_APP_ID
                                  )
 
 
diff --git a/microsetta_interface/routes.yaml b/microsetta_interface/routes.yaml
index 75fd7842..8cad9bf9 100644
--- a/microsetta_interface/routes.yaml
+++ b/microsetta_interface/routes.yaml
@@ -835,6 +835,22 @@ paths:
         '302':
           description: Redirecting to necessary action
   
+  '/accounts/{account_id}/sources/{source_id}/create_skin_scoring_app_credentials':
+    post:
+      operationId: microsetta_interface.implementation.post_ajax_skin_scoring_app_credentials
+      tags:
+        - Survey
+      parameters:
+        - $ref: '#/components/parameters/account_id'
+        - $ref: '#/components/parameters/source_id'
+      responses:
+        '200':
+          description: Credentials for skin scoring app
+          content:
+            application/json:
+              schema:
+                type: object
+
   '/accounts/{account_id}/sources/{source_id}/vioscreen_ffq':
     get:
       operationId: microsetta_interface.implementation.get_fill_vioscreen_remote_sample_survey
diff --git a/microsetta_interface/templates/source.jinja2 b/microsetta_interface/templates/source.jinja2
index eafd0f76..bd36cdf3 100644
--- a/microsetta_interface/templates/source.jinja2
+++ b/microsetta_interface/templates/source.jinja2
@@ -45,10 +45,74 @@
         }
         {% endif %}
 
+        let skin_app_username = '';
+        let skin_app_studycode = '';
+
+        function handleSkinAppModal(survey_link, survey_title, survey_description, app_username, app_studycode) {
+            $("#skin-app-modal-title").empty();
+            $("#skin-app-modal-title").text(survey_title);
+            $("#skin-app-survey-description").empty();
+            $("#skin-app-survey-description").text(survey_description);
+
+            // We allow the function to update the global variables, which will happen when the user receives credentials and re-renders the modal.
+            // However, there's no situation where we'd retract the credentials, so we don't need to do anything with blank values.
+            if(app_username != '' && app_username != 'None') {
+                skin_app_username = app_username
+                skin_app_studycode = app_studycode
+            }
+
+            if(skin_app_username != '') {
+                $("#skin-app-take-survey").html('{{ _('Take This Survey Now') }}');
+
+                document.getElementById("app-credentials-div").style.display = '';
+                document.getElementById("app-credentials-username").innerHTML = skin_app_username;
+                document.getElementById("app-credentials-studycode").innerHTML = skin_app_studycode;
+
+                // Once we display the credentials, the button action is to open the actual survey
+                $("#skin-app-take-survey").click(function(e) {
+                    window.open(survey_link, '_blank').focus();
+                });
+            } else {
+                $("#skin-app-take-survey").html('{{ _('Get Username and Study Code') }}');
+
+                document.getElementById("app-credentials-div").style.display = 'none';
+                $("#skin-app-take-survey").click(async function(e) {
+                    let url = '/accounts/{{ account_id }}/sources/{{ source_id }}/create_skin_scoring_app_credentials';
+                    $.ajax({
+                        url: url,
+                        type: "POST",
+                        success: function(data) {
+                            if(!Object.hasOwn(data, 'app_username')) {
+                                // The response doesn't have credentials, something went very wrong. Handle it gracefully.
+                                document.getElementById("app-error").style.display = '';
+                            } else {
+                                let s_user = data['app_username'];
+                                let s_sc = data['app_studycode'];
+                                if (s_user.length < 1) {
+                                    // We weren't able to allocate them credentials.
+                                    document.getElementById("app-error").style.display = '';
+                                } else {
+                                    // We got credentials, refresh this modal
+                                    handleSkinAppModal(survey_link, survey_title, survey_description, s_user, s_sc);
+                                }
+                            }
+                        }
+                    });
+                });
+            }
+            $("#skin_app_modal").modal('show');
+            return false;
+        }
+
         function hideModal() {
             $("#source_modal").modal('hide');
             return false;
         }
+
+        function hideSkinModal() {
+            $("#skin_app_modal").modal('hide');
+            return false;
+        }
     </script>
     <script src="/static/vendor/js/jquery.form-4.2.2/jquery.form.min.js"></script>
 {% endblock %}
@@ -123,8 +187,12 @@
         <div class="row mt-4">
         {% for detail in remote_surveys %}
             <div class="col-12 col-sm-6 col-md-4 p-2">
-            {% if not detail.answered %}
-                <a style="text-decoration: none" onClick="return takeExternalSurvey('/accounts/{{ account_id }}/sources/{{ source_id }}/take_survey?survey_template_id={{ detail.survey_template_id }}', '{{ detail.survey_template_title }}', '{{ detail.description }}');" href="/accounts/{{ account_id }}/sources/{{ source_id }}/take_survey?survey_template_id={{ detail.survey_template_id }}" target="_blank">
+            {% if detail.survey_template_id == SKIN_SCORING_APP_ID %}
+                <a style="text-decoration: none" onClick="return handleSkinAppModal('/accounts/{{ account_id }}/sources/{{ source_id }}/take_survey?survey_template_id={{ detail.survey_template_id }}', '{{ detail.survey_template_title }}', '{{ detail.description }}', '{{ detail.credentials['app_username'] }}', '{{ detail.credentials['app_studycode'] }}');" href="/accounts/{{ account_id }}/sources/{{ source_id }}/take_survey?survey_template_id={{ detail.survey_template_id }}" target="_blank">
+            {% else %}
+                {% if not detail.answered %}
+                    <a style="text-decoration: none" onClick="return takeExternalSurvey('/accounts/{{ account_id }}/sources/{{ source_id }}/take_survey?survey_template_id={{ detail.survey_template_id }}', '{{ detail.survey_template_title }}', '{{ detail.description }}');" href="/accounts/{{ account_id }}/sources/{{ source_id }}/take_survey?survey_template_id={{ detail.survey_template_id }}" target="_blank">
+                {% endif %}
             {% endif %}
                 <div class="card card-survey-external">
                     <div class="row m-2 survey-info-row">
@@ -136,7 +204,7 @@
                         <div class="col-4 small-text survey-info text-end">{{ detail.est_minutes }} {{ _('min') }}</div>
                     </div>
                     <div class="row m-3 text-center survey-title">
-                        {% if not detail.answered %}
+                        {% if not detail.answered or detail.survey_template_id == SKIN_SCORING_APP_ID %}
                             <img src="/static/img/survey_external.svg" class="card-survey-icon-external">
                         {% else %}
                             <img src="/static/img/survey_external_taken.svg" class="card-survey-icon-external">
@@ -150,7 +218,7 @@
                     {% endif %}
                     </div>
                 </div>
-            {% if not detail.answered %}
+                {% if not detail.answered or detail.survey_template_id == SKIN_SCORING_APP_ID %}
                 </a>
             {% endif %}
             </div>
@@ -179,4 +247,34 @@
     </div>
 </div>
 
+<! -- Modal for skin-scoring app -->
+<div class="modal fade" id="skin_app_modal" tabindex="-1" role="dialog" aria-labelledby="skinAppModal" aria-hidden="true">
+    <div class="modal-dialog" role="document">
+        <div class="modal-content">
+            <div class="modal-header">
+                <img src="/static/img/survey_external.svg">
+                <span class="survey-title" id="skin-app-modal-title"></span>
+            </div>
+            <div class="modal-body">
+                <p class="survey-description" id="skin-app-survey-description"></p>
+            </div>
+            <div class="modal-body" id="app-credentials-div">
+                <p class="survey-description">
+                    <strong>Username: </strong><span id="app-credentials-username"></span><br />
+                    <strong>Study Code: </strong><span id="app-credentials-studycode"></span>
+                </p>
+            </div>
+            <div class="modal-body" id="app-error" style="display: none">
+                <p class="survey-description">
+                    {{ _('Sorry, there was a problem generating a username and study code. Please try again later.') }}
+                </p>
+            </div>
+            <div class="modal-footer">
+                <button type="button" class="btn btn-white-blue-border" id="skin_app_cancel" onClick="hideSkinModal();">{{ _('Maybe Later') }}</button>
+                <button type="button" class="btn btn-blue-gradient" id="skin-app-take-survey">{{ _('Take This Survey Now') }}</button>
+            </div>
+        </div>
+    </div>
+</div>
+
 {% endblock %}
diff --git a/microsetta_interface/tests/test_integration.py b/microsetta_interface/tests/test_integration.py
index 375df209..942b96aa 100644
--- a/microsetta_interface/tests/test_integration.py
+++ b/microsetta_interface/tests/test_integration.py
@@ -106,6 +106,7 @@ def _fake_jwt(email, verified, uniqify=False):
 MYFOODREPO_ID = 10002
 POLYPHENOL_FFQ_ID = 10003
 SPAIN_FFQ_ID = 10004
+SKIN_SCORING_APP_ID = 10005
 
 BASIC_INFO_SIMPLE = {"112": "1970"}
 BASIC_INFO_SIMPLE_ALT = {"112": "1983"}
@@ -573,6 +574,11 @@ def _complete_spain_ffq_survey(self, account_id, source_id):
                f'take_survey?survey_template_id=10004')
         return self.app.get(url), url
 
+    def _complete_skin_scoring_app_survey(self, account_id, source_id):
+        url = (f'/accounts/{account_id}/sources/{source_id}/'
+               f'take_survey?survey_template_id={SKIN_SCORING_APP_ID}')
+        return self.app.get(url), url
+
     def test_new_user_to_source_listing(self):
         resp, url, user_jwt = self._new_to_create()
         account_id, _, _ = self._ids_from_url(url)