As someone who was misdiagnosed all through her childhood,Ican't stress enough how important it is that the teachers and staff have as much information as possible. And in some cases they really need to keep an eye on some of the other kids. as you may have already experienced, kids can be incredibly cruel and I spent years being called names by both students and teachers since they just assumed that because I had all these scales,peeling, and bleeding and the occasional odor problem that I couldn't contol, that I was dirty and didn't practice good hygene. That along with the torture of being scrubbed with brushes, steel wool, bleaches, and even borax (yes, borax)to try to control it, made my elementary years a real living hell. It was a real releif to find out that my original birth dx of harlequin was true (they changed it because I survived.) All I can say is keep a very close eye on your child's moods, they won't always tell you they're being picked on.
As always forwarned is forarmed and so the more info you can give the school staff the better. Otherwise just love that dry little kid to pieces and hold him just as much as he can tolerate.
Good luck and keep the faith!