You need to just make one thread
We need more info. Can you post a picture of your enclosure ?
How are you heating the enclosure? Under tank heater? Heat bulb? Do you have a thermostat attached to the heat to regulate it?
How long have you had the snake, has it shed for you recently?
Scale rot can start out that way, but this looks more like a burn. OR a beginning shed.
They burn at far lower temperatures then one would think. It doesn't have to feel burning hot to YOU. We run at far highter temperatures, so when we touch the heat source it should barely feel warm.
Please update with some more info.