Well, Melli will be visiting the vet on Friday. I have had her about 2-1/2 years and she came with an elbow callus. A couple months ago I caught her licking and it bled. I gave her antibiotics in case of infection and have tried thing after thing to settle it back down. She wears her rain coat so she can't get to it. It just hasn't gotten better. It appears puffy instead of flat and kind of lumpy. I am putting a little vitamin E on to moisturize until we can get to the vet in a couple days. While it could be a callus gone bad, I am mentally preparing for tumor and excision. Poor Melli girl. Anyone ever dealt with callus or callus turned tumor?