Blisters On Feet

Blisters on feet and toes are a common problem and cause of foot pain.  A foot blister is a small, fluid filled bubble-like pocket that develops on the upper layers of skin. 

Most commonly caused by friction, they can also occur due to things such as infection, burns and chemical exposure.  They usually contain clear fluid known as plasma, but can sometime contain blood or pus.

Here, we will look at how they develop, the different types of blisters, common causes and the best treatment options for blisters on toes and feet.

How Do Foot Blisters Develop?

Blisters on feet are small pockets of fluid, usually caused by friction

Blisters on feet develop when the skin on part of the foot is damaged, most commonly from friction.  In an attempt to protect itself from further damage, fluid collects under the injured skin to provide cushioning and allow healing. This fluid forms a small pocket, known as a blister.

They can occur anywhere on the body, but hand and foot blisters are the most common.

Types of Foot Blister

Usually, blisters are filled with clear fluid, known as serum (aka plasma).  Serum is one of the components found in blood, alongside red blood cells and clotting factor.  It is made up of proteins, antibodies, hormones, antigens and electrolytes. 

Blood blister on foot

Sometimes, they may also appear red or black which indicates that they contain blood.  This happens when some of the small blood vessels are damaged as well as the skin.  They are known as blood blisters.

If blisters on feet become infected, pus forms and collects giving them a whitish/yellow tinge.

Common Causes

There are a number of different causes of blisters on feet:

1)  Friction

Various sizes of blisters on feet caused by friction

The most common cause of blisters on toes and feet is friction.  They tend to develop when walking or running long distances or when wearing new or poor-fitting shoes (too tight or too loose) which rubs on the skin, causing fluid to accumulate under the top layer of skin. 

Blisters on toes are more common when the skin is moist and warm rather than when it is dry or soaked.  This is one of the reasons people are often caught out – they may not be walking/running any further than normal but if they are going faster, the weather is warmer or wetter or their footwear is warmer material, their feet may perspire more, increasing the likelihood of blisters on feet. 

There is often a misconception that blisters on toes develop from repetitive friction, however, it actually tends to be sudden, brief, intense friction or rubbing on the skin that causes blisters on feet.  Prolonged, repetitive, less intense friction on the skin is more likely to result in foot corns or calluses

2)    Heat

Sunburn can cause blistering on the skin

They can also develop in response to intense heat:

a)  Burns: First degree burns will often blister after a couple of days as they are healing.  Second-degree burns usually blister immediately

b)  Sunburn: Excessive exposure to UV light leads to sunburn which can result in painful blistering of the skin

3)  Cold

Frostbite blister on foot, 3 days after exposure

Tissue damage from frostbite can also cause blisters on feet.  When we are exposed to temperatures below freezing, blood vessels contract pushing blood away from our extremities, particularly the hands and feet in an attempt to keep us warm.  This can lead to skin tissue damage and even death. 

Frostbite can be categorized in four stages.  Blisters on toes are usually associate with second-degree frost bite.

Effects of blister agent contact with skin

4)  Chemicals

Skin may also develop blistering when in contact with certain chemicals, solvents, detergents or cosmetics.  It is always advisable to wear gloves when using any chemicals to prevent skin irritation.

5)  Medical Conditions

Chickenpox blister

There are also a number of medical conditions which can cause blistering of the skin such as chicken pox, shingles, herpes, impetigo, cold sores, scabies and some forms of eczema.  This picture shows the classic blisters associated with the varicella zosta virus aka Chickenpox.

Treatment for Blisters on Feet

Most blisters on toes and feet will heal naturally, without requiring medical care.  When possible, you want to avoid breaking them to reduce the risk of infection.  Always wash your hands or wear gloves before touching a blister to reduce the risk of infection.

1) Unburst Blisters

If possible, avoid bursting blisters on feet.  Leaving the skin intact provides a natural barrier, reducing the risk of infection.  As it heals, the skin will naturally harden and fall off.  Ideally, leave blisters on feet uncovered and avoid wearing any shoes that rub.  If necessary, you can cover them with either a plaster or gauze pad depending on their size or try using a product such as a Compeed dressing pad to prevent further friction on the area.

Burst blister on toe.  Avoid removing the dead skin when possible to help reduce the risk of infection

2) Burst Blisters

Most large blisters on toes will break on their own.  Don’t be tempted to remove the broken skin, instead, allow the fluid to drain and then cover the area with a sterile dressing which should be changed daily until it is fully healed.

3) Draining Blisters

Treatment for blisters on feet.  Always wash your hands or wear sterile gloves when touching a blister to reduce the risk of infection

If a large blister is causing considerable discomfort, you may need to drain it.

Wash your hands before you start and use a clean, sterile needle to make small puncture holes around the edge of the blister, rather than the centre.

Gently press over the area so the fluid drains out, then wash the area, pat dry and cover with clean gauze.  Change the dressing daily.

4) Footwear

If your blisters on feet are the result of wearing new shoes, avoid wearing them again until the foot is fully healed.  Then break the shoes in by wearing them for short periods until they soften.

Compeed is a specially designed dressing forfoot blisters

5) Products That Can Help

There are a number of products that can help in treating foot blisters such as special dressings, gauze and Compeed.  Visit the Foot Blister Product section to compare products and read reviews - coming soon!

What Next?

Blisters on feet are just one problem that affects the feet and toes.  You can find out more about other common problems in the causes of foot pain section.

Alternatively, if you want help working out what is causing your pain, visit the foot pain diagnosis section.

Go to Common Causes of Foot Pain or Homepage


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See Also

Common Causes of Foot Pain

Diagnose Your Pain

Foot & Ankle Anatomy

Treatment Options for Foot Problems



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