They are not burns.
They are not from a heat lamp.
They are not blister disease. Blister disease looks nothing like this and is normally ventral - not dorsal.
Folks, please watch what you post. Looking at a picture of a snake and then inferring husbandry do's and don'ts, throwing out WAGs and jumping to conclusions about how the OP may or may not be caring for his snake are pointless and frankly, insulting.
Good advice is to take the animal to a vet. It would be great if the OP could spring for a necropsy to see if there was a systemic cause or to find a definitive diagnosis.
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