I've got a ball python who has recently developed some discoloration on his belly (near the tail). It's sort of a brownish and seems a bit dry--I initially thought it might be a burn but I can't see how that could be. I do use an UTH, but there is a lining underneath his substrate which wouldn't allow him to be in a position to be burned by it. Sorry for the lousy picture quality (hard to get him to hold still long enough to snap the shot):





Thanks in advance for any ideas...