Mr. Jumps isn't our cat -- he isn't anyone's cat right now; his former owners moved and abandoned him, so he's got a few houses in the neighbourhood where he hangs around and mooches food. Ours is one of them.
He came over a couple weeks ago with some fur missing on his wrist. It looks to me like he either touched a candle or an electric burner or something and singed himself. It's starting to grow back now, but it'll probably take a while.