Originally Posted by The Batlord

Aw. You might wanna watch out to see if he gets any weird bulges in his skin. If a cat bites another cat it can cause an abscess, which is an infection that fills with fluid under the skin. If you don't catch them quick they can be really nasty and painful. They just keep getting worse without anti-biotics and can get really, really big. If it bursts you can usually see into the hole it leaves and it just looks like a big cavity in the cat's flesh. Kind of thing that makes you want to throw up. I imagine an animal in the wild may very well die from one eventually. If you see a bulge where the hair has fallen out then it definitely has an abscess and needs to go to the vet.