Thanks, Robin. As to how he might have gotten injured, that's anyone's guess. The guy that owned him before just brought him in without a word, and when I showed interest in the poor little guy he just said I could keep him and left. Based on how the injured area looks, I would say he either had something land on him or he was squeezed way too hard. It's sort of shaped like a squished Hershey's kiss.

We'll see what the vet doth say.