A head source must be regulated by a thermostat. One in the enclosure buried under substrate will get hotter since the substrate acts as an insulator, trapping the heat over the pad.
If your snake has blisters it needs to go to the vet ASAP. I took in a rescue BP earlier this year that had been badly burned, sadly even though I got her to the vet within hours of her being given to me she still passed away due to sepsis because her prior owner didn't think her burns were all that bad so he fooled around with home remedies for a few weeks.
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