1. Celiac disease rash About 17% of people with celiac disease develop dermatitis herpetiformis, an itchy rash characterized by small blisters on the knees, elbows, lower back, or buttocks.

Gluten is only bad for people with celiac disease and dermatitis herpetiformis. Gluten is a common protein found in a variety of foods from bran flakes to pasta to beer. But does cutting it out of ...