I'm not an expert, but I do have a friend who had this condition, and it turned out to be a dietary allergy to wheat. The bad news is that if it is an allergy, it's going to be difficult to track down - barring intensive allergy testing, you may have to just eliminate certain high-allergy foods from your diet and see if that helps.
Is there any new substance (soap, detergent, medication) that you started handling before this issue began?