Agree with above post...he has rubbed off scales on top of his head...it's not red or infected-looking, it's in a "normal" stage of healing. You might always
see a scar on top of his head, but slowly over time should be less noticeable. Nothing you can do for it, but see if there's a reason he has wanted out so
badly (ie. cage too hot? etc) and minimize anything that is abrasive where he might have done this (& might do it again).