Pics would help if the scales are splitting or discolored could be something else. Make sure your substrate isn't too damp. If it is just a scratch should heal up after a shed or two. You can use antibiotic ointment if it looks bad or gets worse just make sure it's NOT the one with pain killer or a betadine soak just use some warm water and add betadine until it's tea colored. I've use both these on snakes that rub their chins. I would put him on paper towel as substrate until it's healed up.