My hamster has a little cut above his nose how do i heal it?

Well my mom bought me two male hamsters for no reason whatsoever. And like 2 or 3 weeks later they started fighting. But only one of the hamsters got a small cut on top of his nose.Dont worry I have a spare cage so i seperated them today.Please tell me how I can heal his cut.I feel so sorry for him :(((