I'll just repost what I did earlier

What's his setup like? Can he get up close to a heat lamp, or does he have a heat pad not regulated by a thermostat? Is there something abrasive somewhere in his enclosure? Any tape on the inside of his enclosure? Pictures of how you have him will help shed some light here. I was under the impression that scale rot usually occurred mostly on the belly, since it's basically caused by constantly sitting in soaked substrate. Looks more like burns to me?

Would not powerfeed. Has he been eating while he's had these marks?