A bald spot? Could you take a picture of it?

Where is it, on top of his wing or under? Under their wings, the feathers are normally a bit thinner than the rest, and may appear *bald* when they take a shower, but when they are dry, there shouldn't be a bald spot. If it was on his head behind the crest, I wouldn't worry, because that could mean he has lutino in him. Its a lutino *genetic thing*. How big is the bald spot? Have you seen him picking at his feathers? Picking and preening is not the same thing. Preening is normal, but feather picking is when they constantly pluck their feathers out, and its not normal. I'll try to look something up for you on the web.