What is classified as "swelling" in the lips? I have seen many different examples and pictures of "swelling" but I'm not sure if the lips in the source are actually swelling or just red from playing. I have had an endurance problem for quite some time because of the enormous amount of pressure I used. Now, a year later, I removed most of the pressure but after I play for 10 minutes or more my top lip starts to form a protruding ring where my mouthpiece is placed. I was wondering if this is actually swelling or just a normal occurrence. If it is swelling, I was also questioning whether I should continue playing afterwards or set the horn down for the rest of the day. Thoughts?