What does a blood blister in the mouth look like? Does it break open?

answered:

Firm and purple

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If you bite your lip/cheek and traumatize inside your mouth, but not enough to break open the suface of skin(mucosa) then you may develop a firm purple-colored bump. Over time the "blood-blister" will pop and drain and should heal quickly. If it does not resolve within 7-10 days, have it checked out.
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Mouth Cheek Blood Mucosa Skin Lip blister Blistering Blood blister