Toward the definition of moderate psoriasis: an expert opinion.

Abstract

Background: The clinical definition of moderate psoriasis is debated, affecting treatment eligibility and patient outcomes.

Objective: A panel of Italian dermatologists aimed to propose practical criteria to define moderate psoriasis, based on a comprehensive literature review and clinical experience.

Methods: The panel reviewed publications between 2016 and 2024 focusing on key severity scores, including the Psoriasis Area and Severity Index (PASI), Body Surface Area (BSA), Dermatology Life Quality Index (DLQI), and Physician's Global Assessment (PGA), along with special area involvement and patient-reported outcomes.

Results: Despite variability among studies, and the lack of universally accepted thresholds, the panel defined moderate psoriasis as a BSA of 5%-10%, DLQI of 5-10, a PGA score of 3, and involvement of at least two special areas (e.g. scalp, face, genitals, nails, hands, or feet). Distressing itch and psychosocial impact were also recognized as critical elements influencing perceived disease burden. A composite PGA-based approach, integrating objective measures with patient-centered criteria, is proposed for identifying patients with moderate psoriasis who may benefit from systemic therapy.

Conclusion: This pragmatic approach may help bridge the gap between guidelines and real-world clinical practice, ensuring more accurate treatment allocation and reducing undertreatment of psoriasis.