It does not look like a burn to me. That said, in the 40 years I have been messing with reptiles, knock on wood, I have not had a burn or scale rot. I have had to deal with a couple nasty infections caused by injury. In any case, I would treat it with betadine daily making sure that some of the liquid runs under the scales. If it doesn't improve after the next shed or it looks like it is getting worse, it is time for a vet trip.