Possibilities : It may be a bruise or a result of an injury (bite fibroma), but best to have it checked by your primary care doctor, who may refer you to an oral surgeon or ENT doctor.
Answered 6/10/2014
5.5k views
Probably a hematoma: You probably bit or injured it someway to cause a hematoma or 'blood blister'. If it does not resolve in 2 weeks, see a dentist, oral surgeon , or physician
Answered 3/18/2016
5.1k views
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