monocentric retrospective-prospective observational study evaluating the clinical evolution of common chronic inflammatory skin diseases, including atopic dermatitis, psoriasis, prurigo nodularis, chronic hand eczema, and hidradenitis suppurativa. The study will collect demographic, clinical, therapeutic, and validated clinimetric data from patients aged ≥12 years. Its primary aim is to describe changes in disease severity over time. Secondary objectives include identifying demographic, clinical, and treatment-related predictors of moderate-to-severe disease and unfavorable outcomes. Data will cover a 7-year retrospective period and a 10-year prospective follow-up.

Inclusion Criteria:

Age ≥12 years.

Patients with a confirmed clinical diagnosis of atopic dermatitis (AD), prurigo nodularis (PN), psoriasis (PSO), chronic hand eczema (CHE), or hidradenitis suppurativa (HS) attending the dermatology outpatient clinics of Fondazione Policlinico Universitario A. Gemelli IRCCS.

Availability of clinical data at baseline and at subsequent follow-up visits performed according to routine clinical practice.

Exclusion Criteria:

Age <12 years; absence of the minimum required data (treatment start date and at least one follow-up visit with a clinical score).

Refusal or inability to understand and sign the informed consent form.

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patients affected with inflammatory skin conditions including atopic dermatitis, prurigo nodularis, Hidradenitis suppurativa, psoriasis