Hm. Definitely not a mite. I don't see legs, so I doubt its a tick. Kind of to red for a tick.
Have you tried to "gently" wipe it off?
I have never heard of that happening, but it certainly does look like a blood blister. I would just keep an eye on that. If that is what it is and it "pops" it will be a open wound and you should probably keep the snake on paper towels for now, and keep the enclosure extra clean.
If it does open, put some Neosporin (without pain relief) on it.
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