We do have a cat that is not declawed and they often play rough and Kermit does get scratches, I was thinking maybe the cat got a little stuck on his butt and now he has a wound? I've been keeping on eye on it and he doesn't seem to be bothered by his bump. He did lick it a couple of times but only after I clean it. He sits down just fine and doesn't cry when I touch it.
Anyone know what it could possibly be?