Hm, yeah I could see that. I got him from a breeder that said he was 3 weeks old. Is it possible that it could heal up that fast? I didn't notice anything on his neck at first, but I wasn't trying to inspect him too much. I have some crappy cell phone pictures, I'll try to look at those and see if I could see anything.
Thanks!
Edit: I looked at the pics and couldn't see anything. Maybe it is a bite that I didn't see... I didn't treat it all though. We weren't holding him for the first week so I don't suppose I would have seen it.