A Case of Psoriasis and Pemphigus Foliaceous in a 55-year-old Filipino

Abstract

Pemphigus foliaceous is a rare autoimmune blistering disease, while psoriasis is a common immune-mediated inflammatory skin disease. The coexistence of psoriasis and pemphigus foliaceous has rarely been reported. We report a case of a 55-year-old Filipino female with an 8-year history of chronic plaque-type psoriasis biopsy-proven. After 5 years, she developed generalized flaccid bullae and crusted erosions over the face, trunk, and extremities, with no mucous membrane involvement. Skin punch biopsy, direct immunofluorescence, and enzyme-linked immunosorbent assay were consistent with pemphigus foliaceous. The combination of topical corticosteroids and oral methotrexate was selected as the therapeutic approach, leading to a notable improvement in the patient’s condition. This case report underscores the significance of identifying the simultaneous presence of psoriasis alongside autoimmune blistering diseases like pemphigus foliaceous. Examining predisposing and triggering factors, performing re-biopsy, and further work-up as the disease evolves may yield more profound insights. Nonetheless, effectively managing this condition poses a significant challenge.