Scabs and swollen scalp

[artsyrobin]

any idea what may be going on with this guy?

I have wormed him since isolating after finding long thin worms, he has had ivomec for mites, a bath, putting bannix on his neck, after discovering neosorin collects dust...
he is thin, but breathing clear

 

[Eggcessive]

I'm not sure if it is something else, but my crested chickens always get their feathers picked out by the other chickens. Polish are the worst. I have to separate in a cage for a couple of days with Neosporin to scabs, then after putting them back with others, I just use BluKote until feathers are completely grown back in. There is a waterproof aluminum dressing that I have been wanting to try the next time it happens:
http://www.neogen.com/AnimalSafety/pdf/ProdInfo/Tech_Bulletins/79100.pdf
http://www.valleyvet.com/ct_detail.html?pgguid=30e077ed-7b6a-11d5-a192-00b0d0204ae5