I have a white crowned black polish that had his crown pecked out. After I isolated him I noticed that he spent a lot of time scratching. I made a post and someone suggested mites. Im not sure how to tell if he has mites or not (I have no idea what to look for) but I treated him for them anyway. It hasn't gotten any better and has actually gotten worse. Now he keeps his crown feathers scratched out himself. Lately he has started to lose his main feathers but I have never seen him scratching anything other than his face and head. He also rubs his beak on everything and shakes his head like there is something in his mouth. Anybody have any idea what's going on? If so what do I need to look for and how do I fix it?