Friction burns are not caused by heat. They're caused by friction, i.e. rubbing on something so fast or so much that it causes a burn. In most snakes, that's a "rub", not small blisters of infection. I would question why a vet would call small blisters under the scales "friction burn" at all.
To me, it looks like "blister disease". I think it's official name is vesicular dermatitis.
You would need to find where the extra dampness is, stop it and clean the entire tank, and the snake and keep everything sanitized(no substrate other than newspaper, no wood, no anything that you cannot sterilize on a near daily basis). The snake also probably needs an antibiotic/antifungal type treatment, although most of what I've read has been the old stand by baytril injections(only from a vet, unfortunately).
Good luck.
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