Still a very angry butt. Between the last post and when we went to the doc the next day, the part at the top got more brown and scabby, rather than bumpy and red.
The doctor was, um, confused, as to what was going on. He called it "interesting." He put Carter on a trifecta of steroid cream (just for a day or so to get the anger away), then antibiotic and Lotrimin. He said between the three, one of them should work. Helpful, right?
And, per NG's suggestion, I also put him in an Epsom bath for a little bit today. It seemed to work on it pretty quickly. The scabby part started turning whitish, which I supposed is a good sign.
Below are some updated pics if you can stomach them. Kinda grody, unless you're into that sort of thing. Which I am. Parts of it look better, but other parts look worse. Damn thing is mystifying.