See a dentist. : A sore covering the left side of your mouth could be a serious problem. You should see a general dentist , an oral surgeon, or an oral pathologist.
Answered 4/15/2013
5.2k views
See your doctor: First get the lesion evaluated by a doctor to rule out anything serious you also may have a drug reaction to a medication please make sure you have good protein intake stay away from crunchy foods which may iirritate your palate.
Answered 5/7/2016
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