A blister is a small fluid-filled bubble that forms just under the outer layer of the skin. The fluid serves as a natural cushion to protect the tissue underneath the skin against friction and irritation. Most often, the fluid inside the blister is serum; however sometimes the blister may be filled with blood (“blood blister”) or pus (if the blister gets infected).
Most blisters on your feet are friction blisters, which often result from socks or shoes excessively rubbing against the skin of your feet.
Foot blisters are very common and not usually cause for concern; however they can be quite bothersome. Many go away on their own once the source of irritation is removed. If a blister pops, it can be quite painful. A popped blister also removes the protective fluid barrier, which can lead to infection or further skin irritation.
Common symptoms of a foot blister include:
A blister is formed by the body’s response to skin damage: In order to protect the tissue underneath the skin, the body builds a fluid-filled cushion (the blister) to protect it from whatever damaged the skin above it. The fluid is often clear (serum). If the fluid is bloody, it is called a “blood blister”.
Foot blisters are most frequently caused by friction. Friction blisters in the feet are typically the result of ill-fitting footwear, which causes excessive rubbing between the skin and the inside of the shoe. Most often, foot blisters form on the toes or around the back of the ankle. They form more easily when the skin is moist and damp, i.e.: if someone has sweaty feet. Although bothersome, friction blisters are not usually serious and often go away on their own once the friction source is removed.
Some of the less common causes of foot blisters can include:
For most people, blisters heal naturally on their own within a few days (so long as they’re left alone and not aggravated). Do not play with or pop a blister.
For friction-related foot blisters, the first step is to avoid the footwear that caused the blister in the first place (as well as any other footwear that will rub up against the area): The continued rubbing action will aggravate the blister.
To avoid additional friction that may further aggravate the inflamed area, you can cover the blister with an adhesive bandage or blister pad. Products specially designed for foot blisters are available at our Toronto foot clinic.
If your blister pops, wash the area with soap and water and then apply a bandage. If your blister is very large or painful, you can see a doctor or foot specialist for additional treatment. This may involve draining the blister and applying an antibacterial ointment to prevent infection.
If you have diabetes, a simple foot blister can easily become an infected wound and lead to complications. Individuals with diabetes must regularly examine their feet for blisters. Continued foot care by a foot specialist is recommended.
Our Toronto foot clinic is open Monday-Friday 9am-6pm, Saturdays 9am-4pm. You do not need a referral to become a patient at our Foot clinic.
Certain risk factors may increase your chances of developing a blister on your foot:
Here are various foot care solutions you can do to prevent blisters on your feet:
*Moisture control socks, insoles, foot powders, and blister bandages are available in our Toronto foot clinic; open Monday-Friday 9am-6pm and Saturday 9am-4pm.