You are going to have to give a clearer and closer picture of the concerned area for anyone to give an opinion. The closer you get on the picture the blurrier it gets around the opening of the mouth and there is no way to see the bottom clearly.
Rubbing doesn't just mean one thing. It can be anything from trying to remove a stuck shed to trying to start a shed to other issues or even normal behavior. Like Starscream said, if you suspect mouth rot you need to actually check the mouth which isn't going to make your snake happy at all
I do hope that heat lamp and heat pad have something to control the heat.
This sample image is what you would need to show to have people here get a better view of what you are concerned about
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