How to Prevent and Treat Foot Blisters When Running

Tips for Runners

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Most runners have had at least one run or race ruined because of a painful foot blister. Here are the symptoms and causes of foot blisters, with tips on how to prevent and treat them.


Blisters on the feet are usually caused by friction, typically between your skin and your sock. Excessive moisture due to sweaty feet or wet conditions can soften the skin, making it more susceptible to friction and blisters.

Wearing running shoes that are too small or tied way too tight can cause blisters. But so can wearing shoes that have a sloppy fit and allow too much movement of your foot.


Use these tactics to prevent foot blisters from running:

  • Shoe Fit: Make sure your shoes fit properly. Your feet swell when you run, so your running shoe should be at least a half of a size bigger than your street shoe. You should have a little room in your toebox. You can learn to lace your shoes for a better fit so your foot doesn't move around too much within the shoe.
  • Socks: Buy socks specifically made for running, such as WrightSocks. Look for socks made of synthetic fabrics (not cotton) such as CoolMax. These wick moisture away from your feet. Running socks are anatomically shaped, helping prevent the sock from bunching up and causing blisters. Also, buy socks with no seams and a smooth surface. Some runners wear double-layer socks created to deter blisters. The idea with those socks is that any friction occurs between the two sock layers instead of your skin and the sock.
  • Lubricant: You can also spread BodyGlide or Vaseline on problem areas. But go easy as too much can allow your foot to slide around in your shoes.
  • Tape or Pads: Some runners also put moleskin or athletic tape over "hot spots" on their feet that are prone to blisters, as a preventive measure. If you do this, just make sure the moleskin or tape is applied smoothly (no wrinkles) and not too tight.
  • Keep Your Calluses: If you go for a pedicure, make sure they don't remove your calluses with a razor or emery board. The callused skin serves as blister protection for your feet. If it's removed, you'll be more at risk for blisters.

Signs and Symptoms

You've probably seen foot blisters before. They are small bubbles of skin filled with clear fluid that can appear anywhere on your foot. Some are painless, but others can be extremely painful—enough to cause you to stop your run. Sometimes, by the time you check your feet, the blister will have burst and you may have a raw spot that may or may not bleed.


The first choice in treating foot blisters is to just leave it alone. The skin serves as protection. It will eventually break and the fluid will drain.

If the blister is painful, then you can choose to drain it while leaving the skin intact. You should sterilize a needle by wiping it with rubbing alcohol, passing it through a flame, or boiling it for 5 to 10 minutes in water. Carefully pierce the blister at points around its edges. Press the fluid out and use an antiseptic cream on it. Cover the area with a product such Band-Aid Blister Block or moleskin to protect against infection and provide cushioning.

If you're running in a race, such as a marathon, and you develop a painful blister, stop at one of the medical stations. They'll be able to treat your blister and hopefully get you back in the race, running pain-free.

Change the bandage daily and check the blister for signs of infection such as redness and pus. See a doctor if you see any signs of infection.


Blisters: First Aid. Mayo Clinic.

How to Prevent and Treat Blisters. American Academy of Dermatology.