First- do NOT pop the bubble. As with any blister, doing so allows bacteria into the wound that can make for a worse infection.
A vet visit would be the best idea right now, though you could wait & see IF any more blisters appear (that would indicate a systemic infection & potentially a worse outcome).
Understand, we aren't SEEING this, nor are we here to take the place of actual medical care for yours or any pet. None of us have a "crystal ball" to foresee the future as to whether it's safe to wait or not. This could be an isolated skin issue, or maybe not. From the placement, it doesn't sound to me like it's a "burn", but that's just a guess.
Also, any infection near a snake's head may be more dangerous than one further away on the body, like on the tail. Best to get it looked at by a good qualified herp vet.
This may help if you don't have one already: http://arav.site-ym.com/search/custom.asp?id=3661
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