I have had Celiac for 10 years and have been on a very strict gluten free diet. In the past I have known I accidentally got gluten by severe headache, stomach ache, fatigue, and constipation. All of a sudden I have developed DH rashes on my knees. Is that unusual when I have never had a DH rash before? And the weird part, is that I did not get any of my usual symptoms of gluten! Could it be a result of something topical and not something I ate? Now I am questioning my diet, and wondering where this new symptom came from. I am hoping I can deal with this without going on Dapsone. Any advice?