Looks like a burn to me.
Heat Rock - NEVER USE ONE. If your snake doesn't have a burn yet, it will soon enough on a heat rock.
Heat Mat - Get a thermoSTAT to control the heat. Unregulated heat mats can spike and be hot enough to burn a snake.
Regardless if it's a burn or scale rot, you can apply Silver Sulfadiazine cream. And you can also disinfect the area with Betadine before using the cream.
I would stop bathing your snake. You want the area to be dry, not wet or moist.
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