He could possibly have mites or a skin infection. If you see alot of flaking around the ears or beak it may be mites or parasites. You can take him into your vet for some medication to remove these. That would give them a chace to see if it looks like mites or if it could be a skin problem.
Let me know if you have more quesitons,
Dr. Debbie
Since we can rule out mites there can be something in the inner er or the sinuses causing the problem. Perhaps they could xray to make sure nothing is going on - or another suggestion would be to try dosing him with prednisone - they would have to formulate that for his weight. If it is somthing inflammatory that will help.
Veterinarian
Full time practicing companion and exotic animal veterinarian