Im not sure where else to go with this, I recently returned from a trip out of town and I had my roommates look over my two rats for me while I was gone, everything was completely fine when I left, when I returned home after two weeks one of my rats had a giant abscess on his side, it is completely raw and oozing blood. He is behaving normally (eating, drinking, moving, etc.) and is not messing with the abscess from what I've seen. I called my vet and they can not see me until next week, and there is no emergency vet that takes rats in my area. I desperately need some advice on what to do.