Effective Spesolimab Treatment for Generalized Pustular Psoriasis Masquerading as Acute Generalized Exanthematous Pustulosis: A Case Report.

Generalized pustular psoriasis (GPP) is a rare and severe variant of psoriasis, often posing diagnostic challenges due to its clinical overlap with acute generalized exanthematous pustulosis (AGEP), a severe drug-induced hypersensitivity reaction. Spesolimab, a monoclonal antibody targeting the interleukin 36 (IL-36) receptor, provides rapid symptom relief for GPP flares, but real-world data remain limited. We report a case of GPP complicated by overlapping features with AGEP, highlighting the importance of precise diagnosis and the efficacy of spesolimab.