<s>[INST] I have a large flap like bump on the inside of my cheek near my back molars like the size of a tictac. It looks the same color as the inside of my cheek only the center is filled white like a pimple. It is not as painful as a canker sore, but there is some pain now and again. It's been there a few days and has grown since i first noticed it. My girlfriend as well has developped one so thinking its something caused by a contagious factor or just big coincidence. What could this be and is this something that needs treated or will drain and go away on its own? [/INST] The ulcer near you molar can be a bite lesion ( your upper and lower opposite molars hurting your cheek tissue while coming together while biting) most probably ,but it is not contagious . infact most of the common oral ulcer conditions are not contagious except herpes . i advice you to visit an oral physician to rule out the rest .At my clinic i advice my patients to start with oral vitamin A supplements  for a fortnight and apply dentogel over the affected area for a couple of days along with betadine rinses .it will take a few days to subside but a visit to a dentist will ensure a proper diagnosis to it and it can be avoided in future.  take care . </s>