Linear IgA Bullous Dermatosis Attributable to the Use of Spironolactone: A Case Report

Linear IgA bullous dermatosis (LABD) is a rare, idiopathic, or drug-induced vesiculobullous disease caused by IgA autoantibodies in the basement membrane zone. An 84-year-old man was started on spironolactone two weeks before presentation for the management of hypertension and heart failure with preserved ejection fraction. He presented to our hospital for evaluation of worsening lower extremity swelling and a painful pruritic rash that started on the day preceding his presentation. On examination, he had 3+ lower extremity edema and an erythematous, painful, pruritic, bullous rash on all his extremities. He had a significantly elevated IgA level (1033 mg/dL). A lesional skin biopsy demonstrated epidermal ulceration with degenerated collagen fibers. Direct immunofluorescence of the perilesional skin showed linear IgA at the dermal-epidermal junction. The rash resolved following steroid therapy and discontinuation of spironolactone. There have been previous reports of bullous pemphigoid induced by spironolactone. To our knowledge, LABD associated with spironolactone has not previously been reported.