It was outside for a day or two, normal behavior, and came back all moody. He originally had a lump, or knot in that area and then it just developed into a hole that smells of decaying flesh. It is moist and he just sleeps all the time. He is also shedding more than usual, I assume that is from it becoming summer but I put that out just in case it is a symptom. I took a pic but cant seem to find how to upload it.