Snapshot A 33-year-old man has a 2 year history of recurrent blistering, and itchy eruptions, especially on his forearms. There are no exacerbating factors. He reports no gastrointestinal symptoms. He has a past medical history of hypothyroidism. Introduction Chronic autoimmune skin disease login to view 2 more bullets Epidemiology login to view 2 more bullets Associated conditions login to view 1 more bullet Presentation Skin findings login to view 4 more bullets Other findings login to view 1 more bullet Evaluation Skin biopsy login to view 3 more bullets Small bowel biopsy login to view 1 more bullet Serologic testing login to view 3 more bullets Differential Diagnosis Scabies (intense unremitting itching) Atopic dermatitis Treatment Lifestyle modifications login to view 1 more bullet Pharmacological login to view 1 more bullet Prognosis, Prevention, and Complications Prognosis login to view 2 more bullets Prevention login to view 1 more bullet Complications login to view 1 more bullet