One of the kittens we took in has a deep red, swollen looking butthole (not sure what else to call it, sorry!) and it's also red and irritated looking on his tail above the hole, too. We have given him two baths with Palmolive in the past week to try and clean him up, but it doesn't seem to be getting better. Should we get something like diaper rash cream or something for it? For reference, he is a long haired kitten and he is 5 and a half weeks old.