A necessidade da imunofluorescência direta no diagnóstico da dermatose bolhosa por IgA

linear immunoglobulin a bullous dermatosis (dbiga) of adults is a rare autoimmune disease characterized by subepidermal blistering and linear deposits of immunoglobulin a (iga) in the basement membrane zone (bmz). owing to the fact it presents clinical and histological aspects similar to other bullous dermatosis, mainly dermatitis herpetiformis and bullous pemphigoid, direct immunofluorescence is required to confirm diagnosis. in this article, we describe a case that illustrates this need.