It does look like old scars....are you sure they were not there when you first got him. Maybe they are getting lighter in color due to an upcoming shed???

Also ticks will raise scales they look like a little black bump under the scales. Get a magnifying glass and try to take a look. You will be able to see them kind of behind the scale...so to speak.

Mind you this is all research I have done and pics I have seen. Never seen it in person. Just read ALOT!!

Is he acting normal?