Red sore in the mouth, under the tongue.

[Toro]

About two weeks ago I noticed my bearded dragon's mouth under her tongue was a darker pink than the rest of her mouth. I had seen it before when she was younger but it promptly went away-- this one seems to be staying longer. My concern now is that she hangs her lips open slightly at all times of day. However her appetite hasn't changed and she sleeps well. Could this turn into mouth rot?

I also read online that not having enough hiding places could cause a beardie to rub/ knock their nose on the glass of the cage which could lead to sores. Mine sometimes will do this.

I took some photos while she ate, I posted pictures below.

What will help it to heal?

 

[CooperDragon]

Are you talking about the pink area on the front of her lower jaw? That doesn't look like mouth rot or anything concerning to me. I've seen a lot of them have that coloration where there is/was a sharp tooth. If she's still eating well then it's probably not bothering her. Keep a look out for bleeding or anything that looks like a sore though, as that could lead to infection.