skin infection

Hello, my bird has a red pimple in his wing edge He's on supplements and was using antibiotics for his treatment He's not itching that area or anything strange tho and still energic i just by accident noticed it today and i can't rest at all I asked a vit but he said that he needs to be in a...

He's been biting at the area for almost a year. Got a scab rips it off then started again. However in the last few days it got like this? He was just at the vet and said the scab was to large to see what's going under there.