Quote Originally Posted by DerekG4 View Post
The mice I feed him are about 13.6-14 grams. He weighs less than 200 grams and I feed him once a week. I thought that would be enough food for him. I guess since he can eat something heavier, I'll probably try a small rat pup or a large rat fuzzy.
he very well could still be hungry, but don't worry about moving him up in size just yet; maybe try feeding every 5 days? see if he settles down on pushing.

but going back to your original issue: it just looks like rub marks. keep an eye on them and they should get better every shed.