let your lips go wild and crusty and gross and go in and get a good size biopsy done and get it anylyzed and cultured for everything and anything.
i had a colonoscopy and endoscpy and everything is all good infact he said my system was great! also another lady had colonscopy and she was all good aswell. i would definately get biopsy, swabs and blood tests done properly and anaylzed fully. then maybe consider colonoscopy