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.

When to See a Doctor

Seek medical advice if:

The blood blister is extremely painful or growing

There are signs of infection (redness, warmth, pus, fever)

Blood blisters appear repeatedly without clear cause

You have diabetes, poor circulation, or a bleeding disorder

Healing takes longer than two weeks

Rarely, recurring or unexplained blood blisters can be linked to underlying medical conditions that require evaluation.