UnloadedRex

this is the newest member of my moms fish tank and I would love any help identifying what disease or sickness it has. It was given to her by a neighbor who also has an aquarium because apparently he was getting harassed by the fish in her aquarium. He had small lumps on him when we got him and we’ve treated the water several times and talked to local pet stores for advice but nothing has worked for this guy. He’s a trooper and doesn’t seem to be super affected as he still eats, swims around, and overall acts normal but this infection or whatever it is seems to keep growing. Any help about what it is and how to treat it would be greatly appreciated.

