Participants with vitiligo will undergo a single-visit data collection per routine clinical practice

Participants with alopecia areata will undergo a single-visit data collection per routine clinical practice

Participants with hidradenitis suppurativa will undergo a single-visit data collection per routine clinical practice

AASIS- is a scale assessing the severity of AA-related symptoms on daily functioning. Each item scored on a 0-10 Likert scale, where 0 = not present and 10 = as bad as you can imagine Higher total score = greater impact

SALT is a Tool developed to quantify AA-related hair loss Total score of 0-100, with 0 = no hair loss, and 100 = complete hair loss

F-VASI is a quantitative scoring tool used to evaluate the extent and severity of facial vitiligo calculated by multiplying the degree of skin depigmentation of the face

VitiQoL is a 16-item instrument assessing impact of vitiligo on QoL. 15 items are scored on a 7-point Likert scale, ranging from "not at all" to "all the time". An additional item (not contributing to total score) assesses current severity of condition on a 7-point scale ranging from "no skin involvement" to "most severe case"

CDLQI is a10-question index measuring health-related quality of life (HRQoL) over the last 7 days for patients suffering from a skin disease. The DLQI is used in participants aged 16 and over and the CDLQI has been validated from the ages of 4 to 16 years. Each item scored on a 4-point Likert scale, where 0 = not at all/not relevant/question unanswered and 3 = very much. Maximum total score = 30 (highest impact on QoL).