Blisters have many different causes. These may include:
- Friction or constant pressure, which can occur with wearing a tight-fitting shoe or gripping a tool
- Second-degree burns
- Contact dermatitis, such as poison ivy, oak, or sumac
- Insect bites
- Allergic reactions
- Reactions to certain medications or chemicals
- Certain cancers
- Blistering diseases, such as, epidermolysis bullosa, porphyria, or pemphigus
- Autoimmune disorders
A blister will often heal without treatment. You may need treatment for a condition that is causing the blisters.
Some general tips for treatment include:
Protect the Area
- Be gentle with the injured area. To prevent further injury, use a bandage made for blisters. Also, put a cushion around the blister to protect it. The blister should begin to shrink in about 7 days.
- Do not pop or lance the blister. Opening the blister increases the chance of infection and delays healing.
- Do not scratch any blisters. If it is infectious, scratching may spread the infection. It also puts others at risk for getting the infection. Try over the counter medicine that is applied to the skin to relieve any itching or discomfort. If you still have problems with the blisters, call your doctor.
Wash the Area
If the blister is closed, gently wash the area with soap and water. Apply a bandage to protect it.
If the blister is open, gently wash the area, apply an antibiotic ointment, and then cover it with a sterile dressing or bandage.
See Your Doctor If:
A blister usually heals by itself. See your doctor if:
- The blister is unusually large—bigger than a nickel
- There are many blisters
- The blister is in a sensitive area, such as on the face or the groin
- The blister is associated with a burn
- There are signs of infection, such as increasing redness around the blister, red streaks, severe swelling, pus drainage, fever, or an increase in pain
To help reduce your chance of a blister:
- Wear shoes that fit properly.
- Always wear socks with your shoes.
- Wear sports socks when exercising or participating in sports.
- Use gloves or protective padding when working with tools.
- Wear a hat, protective clothing, and sunscreen when out in the sun.
- Wear sandals in public showers to protect your feet from athlete's foot.
- Wear long shirts and pants when working outside to protect yourself from poison ivy.
- Avoid skin contact with irritating chemicals
This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.
Edits to original content made by Denver Health.
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American Academy of Dermatology https://www.aad.org
National Institute of Arthritis and Musculoskeletal and Skin Diseases https://www.niams.nih.gov
Canadian Dermatology Association https://dermatology.ca
Health Canada http://www.canada.ca
Blistering skin conditions. DermNet New Zealand website. Available at: https://www.dermnetnz.org/topics/blistering-skin-conditions. Updated September 2015. Accessed August 17, 2017.
Blisters. Better Health Channel website. Available at: https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/blisters. Updated April 2016. Accessed August 17, 2017.
Blisters—causes. NHS Choices website. Available at: http://www.nhs.uk/Conditions/Blisters/Pages/Causes.aspx. Updated March 23, 2015. Accessed August 17, 2017.
Blisters, calluses, and corns. Kids Health—Nemours Foundation website. Available at: http://kidshealth.org/en/kids/blisters.html. Updated February 2015. Accessed August 17, 2017.