I has this happen a few weeks ago:

http://www.ball-pythons.net/forums/s...0&postcount=15

I was amazed that the whole thing left no marks. I know the mouse connected because I could see the reaction.

If there is an infection I would expect increased swelling. Increasing the temperatures is recommended for snakes with infections because it stimulates their immune systems. I've also been told that a corresponding increase in humidity helps "transfer" the heat to the snake. I think you could bump the temps a few degrees and do some extra misting over the next few days while you monitor the injury site. Running your snake a bit hot (mind you I mean only 3 to 5 degrees) for a few days won't hurt him and it will probably decrease the chances of an infection getting out of control.

Please understand I'm not suggesting anything here as an alternative to seeking veterinary care. If the bump size doesn't start shrinking (or at least level out) within a day or two I would take him in.