That absolutely looks like a burn. Do you happen to have a heat rock? I know they are not uncommon for pet shops to sell to snake owners even though they are awful to use for any animal because they get so hot. Or if you are using an under tank heat pad, does it have a thermostat?
If that is a burn, which I am positive it is, you will need to find and remove or correct the source of the burn first. Then remove any bedding from the tank/tub and replace it with paper towels for now. You can talk to a vet and perhaps get some burn ointment for it, but be aware they often cause the scales to soften and peel and may scare you into thinking it is getting worse instead of better. Keep the belly clean and dry while it heals. Just like with us, it will be sore for a few days and will take a little while to heal. Once it is healed, any marks left behind will should go away with a few sheds.
Gale
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