Are you talking about the pic near the rear bumper fake vent near the tail light..? I don't think that's a burn, it's just an air bubble that has dirt sitting in it.
What does it look like? The whole tail light turns on it's low beam setting or is it like Forza Horizon with just the center section..?
Pic for reference.
05/30/2022: Changed out the rear pads since my anxiety about the pad sensor being tripped was getting bad, turns out, i had a lot of life left in the stock pads. ? lol oh well, swapped out to PowerStop Evo Ceramics recommended by none other than, @Loco38SUP , thanks for looking out bro! ?? Pedal...