Dermatitis herpetiformis (DH)

Dermatitis herpetiformis is considered the skin manifestation of celiac disease. In people with a genetic susceptibility to gluten, eating gluten triggers autoantibodies against tissue transglutaminase, and in the skin specifically against a related enzyme, transglutaminase 3, now understood as the primary target driving the rash. These antibodies deposit in the skin and set off an intensely itchy, blistering reaction, most often on the elbows, knees, buttocks, and scalp.

Most people with dermatitis herpetiformis also have the intestinal changes of celiac disease, including inflammation and sometimes villous atrophy, even when they have few or no digestive symptoms. Research describes dermatitis herpetiformis as substantially less common than celiac disease itself, with studies from Finland and the United Kingdom estimating roughly one case of dermatitis herpetiformis for every eight cases of celiac disease.

Common signs

Intensely itchy, often burning clusters of small blisters and bumps, classically on the elbows, knees, buttocks, lower back, and scalp, frequently arranged symmetrically on both sides of the body. The itch can be so strong that the blisters are scratched away before they are seen.

This is a plain-language summary for orientation, not a diagnosis. Mechanisms are described as current understanding, not settled fact. Work with your own clinician for your care.