"Does chlorine cause a reaction for those with celiac disease, especially those with dermatitis herpetiformis (DH)?
No such link between the two has been researched or reported."
I found this same website FAQ when I was doing my research. I have found several other DH sufferer comments on forums about highly chlorinated pools triggering a DH outbreak. Personally, I have tested this theory twice and both times it was very apparent that chlorine without a doubt causes a flare up. Although, there isn't any peer reviewed reseach on the subject, the only evidence is personal testimonies.