I came home today to find one of my rats necks had become a huge lump and a large gash in it dripping blood everywhere. We had brought home some new babies the other day and they were introduced yesterday and my two rats that are older got into a scuffle but that was it. I have noticed he is thinner and has not been holding his own in the cage much. So I am pretty sure it is an injury that happened during a fight when I was not home. The babies are not in that cage when we are not monitoring btw. Anyway I tried to clean the wound and when I went to rinse he freaked out a little and red started dripping from his eyes which I know is a sign of stress but this was a ton of it. He is moving on his own and trying to clean it. Any suggestions on how to keep it clean? Any general suggestions on how to take care of him while injured?