Acquired Hemophilia A associated with bullous pemphigoid: A rare combination

Acquired Hemophilia A (AHA) is a rare autoimmune disorder, caused by the development of circulating autoantibodies against coagulation factor VIII (FVIII). AHA is associated with bullous pemphigoid in 2% of patients. We report a case of a 74-year-old man admitted with anemia and a tense subcutaneous and muscular hematoma in the right thigh. Blood analysis confirmed AHA. The patient had a recent diagnosis of bullous pemphigoid. Response to bypass agents and corticosteroids was good with bleeding control and normalization of FVIII and negative autoantibodies, respectively. In a 3-month follow-up period after tapering and stopping prednisolone, a relapse occurred, and immunosuppression was reinitiated. An early diagnosis and effective treatment in AHA are essential to reduce morbimortality. A careful tapering of immunosuppression is important to minimize FVIII inhibitor recurrence, as observed in this case.