Serious rat problem????????????????/?

You can use hydrogen peroxide safely on rats as well as Neosporin. I use it on my boys since they get in random scuffles. Rats heal very very quick if the wound is kept clean, they are tough little things. I would watch them carefully but cage mates do get in fights now and then so as long as this isn't a common thing, and it sounds like it isn't, they should be ok, watch them though. If it happens again, Rosie may just need a break from spazzy little Shelby :).