My knee-jerk response was that it appeared to be a minor puncture wound, but it would likely have healed in 6 mos. and it's not an actual hole, is it?
(from here it actually looks like a heat-sensing pit that ended up in the wrong place)
If it's just a red discoloration that's not increasing at all, my guess is that it's just a petechiae, a tiny bit of bleeding under the skin & the only reason you're
seeing it is because your snake is so light colored. If it changes (gets bigger) by all means have a vet look at it, but my guess is that it's purely harmless.
(people get petechiae too, for various reasons)
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