Dermatitis herpetiformis is an itchy, blistering skin condition that is associated with celiac disease. It is commonly found bilaterally on the buttocks, knees, elbows, face and scalp. A skin biopsy is used to diagnose this skin condition. Individuals with the diagnosis of dermatitis herpetiformis can also show similar damage to the small bowel and show positive response to the gluten free diet.