I asked about these a while back and someone suggested they were a result of not enough actual sunlight. Back then, there were just a couple of flat bumps on Dunky's head. Last week, one opened up (it had a "pit" like appearance) and now it's got that big scab on it. They don't seem to be spreading and he seems to be in overall good health although he is still pretty slender. They do not appear to be itchy to him.
So, the big question... does this look like pox?