I have an adult pupil who has been playing the trumpet almost a year and he has just started to have problems with his lip swelling, he isnt using undue pressure. I changed him to a bigger plastic mouthpiece to help and also rule out allergies. heres what he says "I bought the Kelly 1C mouthpiece and have been using it for a few days. I cannot say it has made any difference. I have reduced my practice to once a day only and do not do more than 30 minutes of little more than a warm –up and gentle exercises. Despite this, the lip problem persists. The swelling appears almost immediately I begin playing but disappears just as quickly once I stop. It becomes more prominent very quickly if higher notes are attempted. Tuning appears alright but the erratic pitching persists and I feel the lip may be the cause. It does not hurt, it is not tender and is virtually imperceptible once the swelling quickly subsides but immediately I resume playing it re-appears !" I have told him to rest completely for a few days then gradually start gentle playing long low notes etc. Has anyone come across this before? Any thought?