Bullous pemphigoid associated with psoriasis: a good response to methotrexate.

Psoriasis has been associated with various autoimmune diseases, however, its relation to bullous diseases is infrequent. Of these, bullous pemphigoid appears as the main associated entity, even though both conditions differ considerably in demographic and clinical aspects. We report the case of a 42-year-old female patient, with long-standing psoriasis who consulted due to the exacerbation of psoriatic plaques associated with generalized bullous lesions on the skin and oral mucosa, with one-week duration. With clinical signs and histopathological findings compatible with bullous pemphigoid associated with psoriasis, we decided to treat her with methotrexate 10mg a week. The patient had an excellent response after two months of treatment.