I've really stepped up my practicing lately. Lots of Arban, working hard excerpts, many scale studies and alot of Clarke. This AM when I looked in the mirror, I noticed it: a white, flaky, patch of skin right where I set the mouthpiece. I never thought I used alot of pressure or abused my chops. In fact, I've never had a mark before that I could notice. (I do have a mustache, so that may have hidden one). I do not notice any ill effects on my sound. In fact, I feel as though I am locking on to a far better sound that is richer. Yet I am concerned by the mark on my lip. Is this eveidence of pressure or simply overplaying? Is it a scar?