Hi Duffy, I have DH also and my doctor told me to use Neutrogena Sensitive Skin uva/uvb Block. SPF 30. Active Ingredient 9.1% Titanium Dioxide . Hope this helps. Good luck Margaret
Your question puzzles me. DH is never caused by your skin coming into contact with gluten. It is caused by the reaction of your gut to any gluten ingested.
Any sun cream should be fine for you to use, even if it contains gluten - so long as you don't eat it!!
I know that for DH sufferers we should avoid iodine coming into contact with our skin as this will bring out the blistering.