abnormal feather loss

by Alyssa
(New York)

I have an 8 month old Indian Ringneck and he is losing his feathers, he is not molting because its been too long and no feathers are growing back but I do see pin feathers. he is bald on his head and neck, I though it might have been an iodine deficiency and started putting iodine drops in his water and since he doesn't drink that much I put the iodine water in his fruits and vegetable dish and still no feathers growing back! he is acting and eating normal and playing. please help!