This is so faint, if it is some sort of bacterial skin issue (hard to tell in pic) it is very minor. May be more along the lines of a minor bruise, etc.
Just to be safe, keep the snake 100% correct in husbandry. That means controlled heat (on thermostat), perfect heat gradient and ambient. Snug hides in cool and warm areas. Privacy to keep it low stress (not a big exposed area) Keep handling to a minimum for a while and keep the snake on VERY VERY clean substrate. If in doubt about skin issues, use paper towels and switch them out as soon as they are dirty.
Blister disease usually happens with the immune system of a snake is stressed and the husbandry is of. Dirty or wet enclosures also factor in.
Not every post gets answered right away. There isn't always someone online that knows the answer, and sometimes a post rolls down and doesn't get noticed. Meanwhile, googling these issues will also provide a bit of help if time is of essence.
Hope that helps a bit.
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