How often do you disinfect the enclosure and thoroughly clean the water bowl? That bowl has algae growing in it and if the tank has never been thoroughly disinfected, what ever is causing the infection is still in the tank. I would start by removing the driftwood in case it is causing allergic reaction. Remove all items form the tank and disinfect it properly. Add new items (do not return the old items unless you boil them or wash them through a sanitizing cycle in a dishwasher) and different substrate.
Please post the hot side temperature, cold side temperature, ambient air temperature, humidity, what thermostats you use for regulating heat sources, and how often you sanitize the enclosure.
This looks like a case of an infecting agent (bacteria, viral, fungal, etc) irritating and infecting wounds. Said wounds could be from irritation, allergies, or infection.
You can take the snake to a vet all you want but if you keep reintroducing it back to a contaminated cage, it will keep getting reinfected.
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