Duo puts his hand over the bump and tries to think about healing it. He's terrible at healing magic still, but he's going to try for Sheik's sake. He thinks really super hard and that should at least make the pain go away along with most of the swelling.

By the time Duo's done, the tub is filled with nice, hot water. Not too hot though. Duo's careful not to boil Sheik. "There ya go. That should feel better and now we can get you clean."