i'd say thats pretty normal, mine gets marks like that sometimes after he sheds, and the scales will look kinda dimpled and rough, but it always goes away. the only thing i'd watch for is bleeding, mines had a couple really rough spots that were basically like rug burn almost and they would kinda bleed and puss a little, not really noticeably, just if you rubbed your finger on it you would feel it, if that happened, maybe put a little anti-biotic stuff on it