One of my girls, Lexi, has had one for at least 3 months now, and it was black and shiny, and now it's red and ulcerated. We took her to the vet, but they think it just wont heal because she keeps licking it. However, they did give me some antibiotics, and some wipes medicated with Malaceb. (sp?) It hasn't gotten any better, and the vets told me to wait a few months to see, then if it's still as bad, they would check it for a benign type of cancer..... really weird. But it doesn't seem to bother her, it just looks bad.