• 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