I've never actually seen any burn other than a severe one in person so I can't tell.
I went away this weekend and left my snake in the care of my father while I was gone. While regulated by a heating pad, I've never seen the floor temperature go above 86 degrees. He's on newspaper and to my knowledge has never come directly into contact with the floor of the cage.
I left Friday and came back monday and his belly looked like this.
He just shed about 2 weeks ago, eyes are clear and his scales are bright and clean as ever. I'm kind of worried, because he's never looked like this pre-shed before.