I think my snake has a burn.

[zina10]

Don't worry about such a thing as bio active.

You need to concentrate on the BARE NECESSITIES. Nothing else is as important as that. These snakes are from a region which has higher temps then we usually have. So yes, we do need a heat source. On the other hand, to high temps cause burns, neurological issues, death. A thermostat is 100 % non negotiable.

I rather see a snake in a plain tub you can buy for $15 that has been rigged with the UTH on a thermostat then a snake in a big tank/cage and incorrect heat.

That snake may very well have a burned belly. The pink you see is just the beginning. That will quickly turn far nastier. Very painful, as well. As Sunny pointed out, you are not a beginner. You knew better.

But what is done, is done. All you can do now is to get your husbandry 100% right. Like NOW. Get a thermostat. Don't guess temps. Get them right, period. If your humidity is to low then cover most of the lid. Add a larger bowl. Mist part of the tank several times the day (don't get all areas wet, though)

Again, if there is a burn, don't put her on soil or even substrate, forget about bioactive for now. What you need is to keep that snake as clean as possible. Meaning on paper towels that will need to be changed often. The burn will need to be treated. This will take a while. If this will turn into a bad burn, you will need a vet to prescribe you certain salves you should use. Sure you can try DIY stuff, but burns can kill. The chance for infection is high, and the snake can quickly turn septic.

Share pictures, let us see how it looks. Fix everything asap, you can get a thermostat for $30 or so on Amazon. Start looking around to see if you can find a Vet, you may need one.

Good luck to you and the snake..