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Persistant blood blister in mouth

I have a persistant blood blister in my mouth. It always occurs in the same place. When broken, after which a small amount of blood/blood serum comes out, it goes away for a nonspecific amount of time and returns. It will start off small and grow over the day. At it becomes larger, it grows more painful. Any ideas as to what this could be?
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A related discussion, blister near gum line was started.
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MEDICAL PROFESSIONAL
Depending where it is it could be a blocked mucous or salivary duct that gets traumatized. When it occurs why don't you get a consult with an oral surgeon.
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Also, it's located in the back of my mouth on the flap of skin that  runs along where the wisdom teeth (which I had removed 6 years ago) would come in.
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