My rat has a sore on his lip, help?

  A few days ago we found him bleeding from his mouth, and couldn't figure out what was wrong. A few days later it is apparent that he must have bit or cut it. It now is an open sore, it looks like an ulcer or kankar sore.



What can I do to help heal it, it wont dry out because it's by his mouth and wet all the time. Is there anything I can put on it? Thanks.
NeoSporin works extremely well on humans, check with the vet, maybe you can use it on him!



=)