I have been playing for a little under a year. Recently I have a been getting a lot of mouth ulcers, especially on the inside of my lower lip. My oral hygiene routine is fairly good and I don't have any other health issues that could cause this as far as I know. Could this be caused by my trumpet playing? I practise 1-2 hours per day and I have tried to avoid excessive mouthpiece pressure. Has anyone else experienced problems like this as a result of trumpet playing?