After suffering with this for most of my adult life I've reduced the itchiness and now get a minor outbreak only every couple months or so (a significant improvement--before I always had the rash somewhere on my body, i.e., back of arms, calves, sides, chest, stomach). I've made two significant changes to my diet that are most likely responsible for reducing the rash:
- I completely eliminated gluten and soy. Even trace amounts will trigger the itch and rash. I've had to basically stop going to restaurants (I will still eat at steak houses, on occasion). I believe in your husband's case that it could be any number of allergenic foods, including nuts or eggs (or something else?). He'll need to do a serious elimination diet.
- I cut out all starches. I'll occasionally have some onion or garlic in a stew. But no more rice, no more gluten-free flour concoctions. This has given me back my digestive tract and, while I can't correlate directly to the improvement of my skin, I suspect they're related.
Let me ask you this: do really hot showers and baths produce temporary relief? Are there any digestive issues in addition to the skin? I, too, went through an antistamine (and cortisone cream) phase. Now I manage through strict control of the allergens and starch elimination.
Note that I've eliminated eggs and dairy and have re-introduced them without a problem.