Dermatitis herpetiformis is an autoimmune skin disease that causes recurrent, intensely itchy blisters to form on the elbows, knees, back, buttocks, and/or scalp. It is linked to the ingestion of gluten found in wheat. It can also occur with celiac disease and has been associated with thyroid disease. The condition is more common in men and people of northern European descent. Treatment includes adhering to a strict gluten-free diet. Oral medications such as dapsone are also commonly used to treat the condition.