Use a little bit on Neosporin. If it doesn't come off with the next shed maybe take it to a vet, but it should be fine. and remember, never feed a snake live prey, I mean frozen/thawed or even pre-killed are fine for your snake, and then you don't have to worry about it getting bitten. take some tongs and wiggle the mouse/rat in front of the snake, maybe even tap the nose of your snake, this should be enough for it to stike and coil, let the mouse go and there ya go!
-Colin