The best I can figure it looks wartish? Never encountered this before, it showed up about 2-3 weeks ago as a small hard lump, and then over the last 1-2 weeks it got bigger, lost the hair and became all scaly and gross on the outside. It hasn't changed in about a week now. I assume I'll need a vet eventually to have it removed, but it would be nicer to coincide it with the spring teeth floating if possible!
These were the best pics I could get, my camera sucks and Jynx is like a 3 year old with ADHD.