My poor baby has some kind of fungal skin thing going on. I think it's ringworm. I was treating it with this oral stuff my vet gave me plus a topical application, and it seemed to be improving slightly. Then I went on vacation and let my roommate watch her, and when it got back, it was 10X WORSE. Also she needs one of those cones to prevent her from licking off the medication at the base of her tail.
I found a different vet--we'll try to see him Monday. Ringworm apparently resolves on its own in a few months, but I can't go the next three months with her looking like I use her for catfighting.