How long?: The question is; hoow long has it been there? It could be from trauma such a biting the lip. Most lesions will resolve in 2 weeks time. If it persist, it should be examined by a dentist trained in oral medicine.
Answered 10/31/2012
5.5k views
Precancerous legion: This could be a pre-cancerous legion if there is a history of trauma, smoking and or alcohol usage. If it has been there for more than three or four months, go to an oral surgeon or a dermatologist and have a biopsy taken.
Answered 11/3/2012
5.5k views
Needs evaluation....: That lump could be a number of things, none of which can be accurately diagnosed over the internet, especially sight unseen. Your dad should be seen by a general dentist or oral surgeon in order to determine what that lump is and what, if anything, needs to be done. Merely giving you a list of possibilities will neither be helpful nor ease your concern.
Answered 12/9/2013
5.4k views
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