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Is it safe to cut a blister?

Published in Blister Treatment 2 mins read

It is generally not recommended to cut a blister unless it is large, painful, or likely to be further irritated.

Why You Shouldn't Normally Cut a Blister

According to available sources, the fluid within a blister serves an important purpose. The blister acts as a protective barrier, keeping the underlying skin clean and preventing infection. The fluid in the blister aids in the healing process. New skin forms underneath the blister and the fluid is naturally absorbed by the body.

When Cutting a Blister Might Be Considered

While it's best to leave most blisters alone, there are exceptions. It may be necessary to cut or drain a blister if:

  • It's very large and causing significant pain.
  • The blister is located in a place where it's likely to be further aggravated (like the sole of your foot).
  • The blister is limiting your ability to perform daily tasks due to its size or location.

Safe Puncturing Method (If Necessary)

If you determine that draining a blister is necessary, here's a safer method to minimize risks:

  1. Clean Your Hands: Wash your hands thoroughly with soap and water.
  2. Sterilize the Needle: Use a sterilized needle (e.g., using an alcohol swab or holding the needle in a flame for a short time until it's red-hot, then allowing it to cool).
  3. Puncture Gently: Make a tiny puncture at the edge of the blister. Do not remove the roof of the blister.
  4. Drain the Fluid: Gently press the fluid out.
  5. Keep it Clean: Once drained, cover with a bandage, and monitor for signs of infection.

Things to Avoid When dealing with Blisters:

  • Do not peel off the blister's roof: The skin over the blister helps to keep the area clean and prevent infection.
  • Avoid cutting into a blister without sanitizing: Failure to sanitize tools or hands increases the risk of infection.


Action Recommendation
Cutting a blister Generally not recommended
Leaving blister intact Recommended for most cases
Draining a large blister Acceptable if necessary and done safely
Removing blister roof Avoid


In conclusion, while it is generally safer to leave blisters intact, carefully and hygienically puncturing them may sometimes be necessary for pain relief. If you are unsure or the blister becomes infected, seek advice from a healthcare professional.