Rooster with a white head

I have a little mille fleur rooster who was doing awesome, then all of a sudden he has developed a white head and has lost his feathers from his head. He is eating and drinking well, just seems a little dozy and funny looking due to having lost all the feathers on his head. He looks like a turkey vulture, just his feathering starts just below his head. His comb and his whole head looks whiteish with a pink tinge underneath. I don't have a working camera, so I can't take a pic right now. IF anyone has any ideas please let me know what it could be. He has been here for quite a while now, and no new birds have been added to my flock since the sale in Red Deer.

If he is in with other birds someone is likely picking.
Heather

will try taking him out and placing him in a pen with just him and his little hen and see if he improves!! Thanks