Is a red blister inside my cheek a blood blister or cancer?

answered:

Not necessarily

Blood
you need to have your doctor look at it.
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Blood blister

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If it hasn't been there for more than a few weeks and it's in an area where you can accidentally bite your cheek, it's a blood blister. Keep an eye on it. If it doesn't go away after a few weeks, see a doctor or dentist.
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