Many reasons: Have an examination with a dentist. Someone with oral medicine experience would be a good bet.
Answered 7/26/2013
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Many options: This could be drainage from an abscessed tooth. It could be an apthous ulcer. They are small, painful and recur. Do you notice the ulcer after eating certain foods or after a lot of stress? I would get this evaluated by your dentist.
Answered 9/28/2016
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