Using your hand to judge substrate temp really isn't a good plan. You need something like a digital temp gun or even an Accurite so you can get a better idea of the temps your snake is dealing with right at substrate level or below if this snake has a tendency to shift it's bedding away.
Doesn't really look like a burn to me though. More like a bit of belly rot starting up. I'm not familar with that type of substrate. Is it hard to see waste products in? Does it tend to get damp and stay damp?
Personally I'd pull out that bedding, replace it with layers of plain white paper towel (I like the Viva brand...it's cloth soft and pure white) and apply a bit of Neosporin without pain killer once daily to that area. I'd also remove any sharp edged or rough surface cage furniture until that belly is right again. If it gets any worse, you'd likely want to have an experienced herp vet take a quick look and do a hands on proper diagnosis.
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