Hey my Oscars skin is wearing off and it has stopped eating. What should I do?

Hey Can anyone tell me what is happening to my Oscar? Its skin is turning white in some areas and plus it is losing its fins slowly, it is losing its beauty completely. What should I do to stop this disease? What is it called? It has also stopped eating now. What is happening to it? Please tell me|||It%26#039;s probably hole in the head or a body fungus. You need to move him to your quarantine tank if you have one and start medicating him. I would start treating with pimafix asap. You can find this at most pet stores.