A blood blister in the mouth often occurs when blood vessels beneath the surface rupture. The trapped blood then causes a raised, fluid-filled sore.
How Blood Blisters Form
Blood blisters in the mouth form due to the following process, according to the provided reference:
- Blood vessel rupture: Many blood blisters develop when blood vessels just below the skin rupture.
- Blood trapping: The blood from the ruptured blood vessel becomes trapped under the skin.
- Blister formation: This trapped blood causes a blood blister to form, resulting in a raised area filled with blood and other fluid.
