Common Causes of Blood Blisters

Most blood blisters are the results of sudden pinching or repeated friction, such as:

Slamming a finger in a door

Wearing tight or poorly fitting shoes

Using tools or sports equipment without protection

Repetitive motions that create pressure on the skin

Blood blisters in the mouth can result from:

Accidental biting

Dental procedures

Sharp or poorly fitting dental appliances

In some cases, blood blisters may appear more easily in people with:

Thin or fragile skin

Circulation issues

Diabetes

Certain blood or clotting disorders

Symptoms to Expect

A blood blister may cause:

A raised, bubble-like area under the skin

Dark red, purple, or black coloring

Tenderness or pressure pain

Occasional swelling around the area

Most blood blisters are not dangerous and heal on their own within one to two weeks.

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