Lets say there is a hot spot in the tank. One round burn shows up, and you think scale rot. Snake goes back into the tank for another night. More similar sized round burns show up because as the snake moves around, its body touches that one tiny hot spot more and more.
The scales coming off could be from the Neo. So we have two unrelated symptoms from two different sources.
I'm not an expert, vet, or even an experienced enthusiast. Just an idea to throw out there.
Evidence to support it would be if the spots are all about the same size, and if you can find a hot spot in the tank.