This multicenter retrospective observational registry study will collect existing clinical data from Italian centers to describe epidemiology, treatment patterns, clinical evolution, safety, and comorbidities in patients aged 12 years and older with psoriasis, atopic dermatitis, vitiligo, alopecia areata, or hidradenitis suppurativa.
Documented diagnosis of psoriasis, atopic dermatitis, vitiligo, alopecia areata, or hidradenitis suppurativa.
Age 12 years or older at the first recorded visit.
Eligible for or treated with systemic therapies.
At least one documented visit during January 2016 to December 2025.
Opt-out exercised.
Medical records with insufficient data.