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    small blood blister on back gums
    Kaydee040809 posted:
    My sister has a tiny blood blister in the back of her mouth behind her last molar tooth.She noticed it today when brushing so not 100% certain how long its been there but assuming just 24 hours.It is about the size of the tip of a ball piont pen maybe slightly bigger.It doesnt hurt her,but shes concerned of the cause and wondering wether or not its something that might need professional care.Any advice would be appriciated.
    Zev Kaufman, DDS responded:
    Dear Kaydee040809:

    The general rule of thumb when it comes to the mouth and mouth lesions is "two weeks", especially when there are no other symptoms such as pain.

    If the sore, blister, etc. is there for over two weeks it is time to go and see your dentist.

    The chances are that the sore is just a blood blister caused by trauma such as biting into something hard.

    Since you do not know when it started and you have noticed it for about a week, wait until the end of the upcoming week. If it is gone, it was probably caused by trauma. If it is still there, please go see your dentist for a correct diagnosis.

    Best wishes,
    Dr. Zev Kaufman

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