Got home this evening and my beardie make has a black spot on his lower jaw I looked up mouth rot and it doesn't look like that. Hes 13 weeks old. Housed on paper towel. Have two repti sun 10.0 fluorescent bulbs and a basking light that keeps their basking surface area at about 108. Over on the cool side is about 88ish.
I'll post a pic in a few minutes.
Have you tried soaking him in a bath and trying to wash it off? Hopefully all it is is some stuck on food or poop. It's happened before. Does it seem to be sensitive to the touch or inflamed?
I would see if it washes off. We had the same thing happen with one of our lizards and brought him to the vet and felt like *****s when she took a wet qtip and it wiped off. haha.
HAHA thats hilarious because my beardie had that exact problem, looked just like your guy in the pic, I took pics and was gonna get around to posting it to ask for help but then it mysteriously dissapeared, lol