Dermatitis herpetiformis is the answer.
Dermatitis herpetiformis, also known as During's disease, is characterized by red clusters of highly itchy (itchy) blisters. The elbows, knees, scalp, and buttocks are most commonly affected. The mucosa is rarely involved.
Dermatitis herpetiformis (DH) is a chronic, severe itchy vesicular skin condition of gluten-sensitive enteropathy commonly known as celiac disease. DH is a skin rash that affects about 10% of people with celiac disease.
Dermatitis herpetiformis looks like a collection of itchy ridges that can easily be mistaken for acne or eczema. Blisters can also form and can be misdiagnosed as herpes.
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