Thanks for the info. We went thorugh when the bumps first appeared and tried to take away anything that had changed recently to make sure wasn't allergic to something new in his enviroment and he's not had any changes in routine since then. At this point, if it is an allergy in the house, it probably is to dust but he hasn't had that same huge breakout in bumps just a few here and there. I'll try some supplements and maybe change shampoos to something that says no soap as saw that on some other posts. He doesn't seem to be bothered much, just a little itchy and the hair might be somewhat more thin but he doesn't have bare spots. It's really hard to be patient though when I just want to know what is causing it! Thanks again!