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.

Should You Pop a Blood Blister?

In most cases, no. The intact skin over a blood blister acts as a natural barrier against infection. Popping it increases the risk of bacteria entering the wound and can slow healing.

If a blood blister bursts on its own:

Gently clean the area with soap and water

Apply an antiseptic

Cover with a sterile bandage

Keep the area clean and dry

How to Treat a Blood Blister at Home

For uncomplicated blood blisters:

Reduce pressure or friction on the area

Apply a cold compress for 10–15 minutes to reduce swelling

Keep the blister clean and protected

Wear properly fitting footwear or gloves if needed

Avoid harsh chemicals or home remedies that can irritate the skin.

Blood Blisters in the Mouth

Oral blood blisters often heal quickly but can be painful. Rinsing with warm salt water can help reduce irritation and keep the area clean. Avoid hot, spicy, or sharp foods until healing occurs.

If blood blisters in the mouth appear frequently or without injury, it may be worth discussing with a dentist or doctor.

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