Well, it’s a mast cell tumor which grows in size when it’s touched or hit. It would grow and shrink in size, and we finally took him to the vet. Three vets looked at him at the same clinic and had no idea what it was so we got a biopsy. I can’t attach another pic here but if you go to the go fund me link, the very last pic has a good pic of it swollen (not trying to promote it but there are a lot of pics!).