If he doesn't take it to the vet it will likely die, from the looks of it it will probably die anyway. I am not going to diagnose it although I have a good idea what it is. It should have been taken to the vet a long time ago. This is really sad and a perfect example of why hobbyists get a bad reputation. We have a responsibility to give our captives the very best care possible, even if it costs us a few dollars.