They don't look exactly like what mine had but my BP had this strange tiny line of brown, rusty-looking scales on his spine. Was worried for the longest time that it was scale rot or some other ailment but it disappeared after his first shed with me so it's clear they were just scuffed up scales from whatever he bumped into. So as Craiga and Luvyna said it might merely be a case of simple wear and tear, but keep an eye on it nonetheless.