To be clear, this is NOT an imprint of the mouthpiece that's caused by too much pressure. This is a small mark/flap near the spot where the inside of my mouth meets the beginning of my upper lip. Is this normal? Should I take a day off practicing to heal?

I was feeling a bit of pain/discomfort for a very brief moment last night that I assumed was from too much mouthpiece pressure, but in hindsight, that probably wasn't the issue -- mouthpiece pressure is a habit I am lucky enough to have never developed (tightening the corners on the other hand...) and it happened when I played louder, not higher. I noticed the small flap/mark this morning while brushing my teeth and am now wondering if that's always been there (maybe a result of developing the aperture over the years) or if it's something temporary and related to the discomfort I felt last night.