It would be easier if you sent a photo of your own snake so we could see the issue better because maybe you are having the scale rot issue if it is getting worse? If it is a burn and it isn't being treated properly then it could become infected and get worse. I'm not the most educated on burns so that's the best I can do as far as suggestion and I could also be wrong. There are others here more capable of helping you and this forum has threads touching on these subjects as well!
If you do post photos of the issue I would post it in your own thread since this one is on the other persons issue and it could become confusing with people trying to help two different people in the same thread.