Hi. The blisters are a form of celiac. Called dermatitis herpe tiformus. I had that on my elbows, knees and lower back. Was diagnosed with celiac, and dr. Told me that it is a form of celiac also I have GI symptoms. I took dapsone for 2 years, and it helped with the blisters, but I decided to follow a full gluten free diet, and I don't get blisters anymore...