D.D.
I would take him to a pediatric dermatologist. I have skin issues which I HATE and would have liked my Mom to have learned what to do with them when I was younger.
It is worth the drive to Children's to get it figured out. My daughter sees Dr Mancini. Look him up on their website and get a location and phone number! I have contact dermatitis...I have allergic reactions to things. It stinks but at least now I know why...