I think Dh is always blistery and itches. I think the amount of itchiness may just depend on each person's ability to tolerate it.
"Dermatitis herpetiformis (DH) is an itchy, blistering skin condition that’s a form of celiac disease. The rash usually occurs on the elbows, knees and/or buttocks, and is characterized by its bilateral nature; both knees (and/or both arms) are affected, seldom just one. Many people with DH have no digestive symptoms and only about 40% of them have the positive blood tests (serology) for celiac disease. However, they almost always have the same, gluten-dependent intestinal damage as those with the more common symptoms of celiac disease."
Not sure if we have any currently active members with skin biopsy diagnosed DH?