It is a bit hard to tell but it is either stuck shed in places or some scales that came loose. Did he back over something rough. He may have scraped against something hard as he was backing up and popped a few scales out of place. That should clear up in a couple sheds if that is the case. Look for something in his enclosure that may have scraped him. Make sure if it is sharp or overly rough you remove it so there wont be any injuries. Just my thoughts. Good luck!!