Can't be sure: ..Without an exam but it is likely either a bruise if you have had any trauma recently in that area or a result of food/drink discoloration. I think these are the most likely causes but you really should be seen by a dentist for an exam to rule out more serious and less likely possibilities.
Answered 2/3/2017
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A doctor has provided 1 answer
A doctor has provided 1 answer
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