Many reasons: Trauma, ulcer, infection, just to name a few. Only way to find out is see your Dentist who can do a physical examination, determine the reason, and then suggest the proper treatment.
Answered 8/14/2014
3.8k views
Evaluation: Your lip needs to be physically examined to answer your question.
Answered 8/14/2014
3.8k views
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A doctor has provided 1 answer
A doctor has provided 1 answer
3 doctors weighed in across 2 answers
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