Could be: It could certainly be a canker sore, but it could also be other things. Could be that you bit some skin while chewing, could be another type of lesion as well. If it goes away in a week or ten days, I would be reassured.
Answered 7/19/2017
3.9k views
Saliva duct?: Check the other cheek and see if you don't have a similar flab. A saliva gland empties here. Sometimes they get irritated.
Answered 7/19/2017
3.9k views
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