Bullous Pemphigoid: A 10-Year Study of Discordant Results on Direct Immunofluorescence.

Background: Bullous pemphigoid (BP) is the most common subepidermal autoimmune disorder characterized by tense bullae. It is associated with circulating autoantibodies against BP antigen-1 and BP antigen-2. Diagnosis is based upon clinical, histopathologic, and immunopathologic examination.