WHite Crest (Crown)? Help

[jeldridge6]

We adopted a cute bantam rooster about 2-3 months. ago. He was in bad shape then. He had a really bad case of the pox. I'm guessing he was never vacc. our girls got the pox also except 1, she was vacc. as a baby. The girls have recovered nicely and they have all been vacc. But he has a white coating almost like scales on the top of his head (crest)? And he sneezes ,little ones, not like ACHOOOO... just choo, but alot. The avian Dr. that we trusted has since gone to do other work and the only person around, we don't really like to go to. I've used vetRx and I've used the anitbotic, vitimans and they helped but not completly.
Has anyone ever seen this before? New addict to BYC