W.C.
allergies!! it could be a certain food or foods, such as dairy, or a fruit. it could also be a chemical such as detergent or the soap he uses. eczema is triggered in my child by a few things some of which we are still trying to figure out, such as when she eats too much dairy, i think. she definitely gets it from eating strawberries and we had to stop using johnson's bathing/body products or anything not lightly scented as it would make her itchy. we use aveeno and cetaphil lotion, and also use sensitive skin detergent for her laundry. but this was all a process of elimination. it may take a while to figure it out but worth it in the long run. good luck!!