Here is a picture of Twiggy's back leg. Some of you may remember him from June when he had rear end paralysis. Since then, he no longer seems to have control of his bladder. As a result, the fur on the backs of his legs is always dirty and feels sticky. I combed him once and when I tried to pull the comb through the fur that was stuck together it pulled some fur out. I leave it be now and just try to wipe him down with a wet cloth. Two days ago I noticed he had a bald patch on one ankle and assumed he pulled the fur out himself while grooming. Yesterday the skin seemed really red. Today it looks like this. That spot in the middle might be a scab, but it feels smooth. He doesn't seem bothered by me touching it, but he doesn't seem to be using the leg as much as usual. His behavior is normal in every other way. Any suggestions?