Hi, I've recently been becoming more and more concerned about a white ring on my lips. I think I may have killed the tissue in my lips from too much mouthpiece pressure. It's been there for about a year now but it used to only be visible after I played. Now it's there all the time and It's really worrying me. I still sound fairly good everything up to Bb-C above the staff but I used to be able to do E's and F's With the same amount of difficulty. Could I have possibly ruined my playing (or be ruining it) by over excessive mpc pressure? Can I fix it, and if so, how?