M.S.
It does sound a bit like eczema. I agree with trying to switch detergents and soap that you bathe him with. And get to a dermatologist. If creams/lotions don't help and switching soap doesn't help I'd see if the doctor would write you a script for Nystatin. It's an antifungal. When my daughter was about 3 mo. old she had a wierd rash and we happened to put her on Nystatin for possible yeast infection (often its used for thrush). After 2 days her rash was totally gone! We used Nystatin about 3 times her first year of life to keep the rash away and finally it didn't come back again. Just something to consider if you have trouble finding a solution. A "yeasty" gut can cause skin problems and since my daughter was on antibiotics right after birth, I believe she had some extra yeast in her system from the antibiotics killing the normal, healthy gut flora. Good luck!