I have a grey tiger salamander and he has a bad leg. The leg is swollen about 3 times more usual. I have no idea why this has happened to him. The area where he is kept has not changed in any form for about 4 1/2 years, other than normal maintenance. The front left legs has a hole in it and has drained before and now he has a second place on this same leg. He still eats good. If you can please give me some advice as to what this could be and how it could be treated.I would appreciate any help that you can give me.