Absolutely 100% YES to the trip to the vet. And asap as well.
This looks like Blister disease and I don't like the redness and blood under the skin, it could be the beginning of septicemia.
What you should do until the appointment is keep the snake in a clean and as sterile as possible environment. That means NO substrate, just clean paper towels. Keep the heat and everything else as close to perfect as you can. Small water bowl. Everything clean clean clean. Clean up any mess you see on the paper towels and replace with fresh ones.
That appointment needs to be made ASAP.
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