No fish tanks, get one of these - it's cheaper, more secure, and holds humidity better:
https://www.lowes.com/pd/Hefty-100-Q...g-Lid/50150118
Add an under-tank heater and a thermostat to create a hot spot of 92*F, newspaper substrate, two hides, and a water bowl.
I agree that looks like slipped skin disease. If the snake isn't eating your vet may prescribe injected vitamins.
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