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A blister is a raised portion of the skin that is filled with clear fluid, often caused by friction, burns, or other forms of irritation. Blisters can form on various parts of the body, but they are most commonly found on the hands and feet due to the frequent rubbing or pressure that these areas experience. Blisters serve as a protective response by the body to prevent further damage to the underlying skin layers.


A blister is a raised portion of the skin that is filled with clear fluid, often caused by friction, burns, or other forms of irritation. Blisters on the feet are commonly caused by friction, but there are several other factors that can contribute to their formation.


Here are some of the main causes of blisters on the feet:

  1. Friction: The most common cause of blisters on the feet is friction between the skin and footwear or between different areas of skin. Ill-fitting shoes, particularly those that are too tight or have rough seams, can lead to friction and blisters.

  2. New Shoes or Footwear: Wearing new shoes that haven't been properly broken in can result in blisters. Stiff materials and areas of the shoe that rub against the feet can cause irritation and blister formation.

  3. Moisture: Excess moisture, such as sweat, can soften the skin and make it more susceptible to friction-related blisters. This is especially true in environments where feet are enclosed in non-breathable footwear for prolonged periods.

  4. Heat and Burns: Burns from hot surfaces, liquids, or sunburns can cause blisters to form on the skin, including the feet.

  5. Allergic Reactions: Certain materials, chemicals, or components in shoes or socks can cause allergic reactions on the skin, leading to blisters.

  6. Medical Conditions: Some medical conditions, such as eczema, dermatitis, and certain infections, can make the skin more vulnerable to blistering.

  7. Athletic Activities: Engaging in sports or physical activities that involve repetitive movements, like running, hiking, or dancing, can create friction between the feet and footwear, leading to blisters.

  8. Improper Socks: Wearing socks that don't provide proper cushioning or moisture-wicking properties can contribute to blister formation.

  9. High Impact or Pressure: Activities that involve high impact or pressure on the feet, such as jumping or prolonged standing, can cause blisters to develop.

  10. Medical Conditions: Certain medical conditions, such as diabetes and autoimmune disorders, can affect the skin's integrity and increase the likelihood of blister formation.

To prevent blisters on the feet, consider these measures:

If you have persistent or severe blistering on your feet, or if blisters are accompanied by other concerning symptoms, it's advisable to consult a healthcare professional for appropriate evaluation and guidance.

How do blisters form?

Typically, this is how a blister forms:

  1. Friction or Irritation: Blisters often occur when there's repetitive friction or rubbing against the skin. This can be caused by ill-fitting shoes, rough clothing, or tools.

  2. Separation of Skin Layers: The friction or irritation causes the outermost layer of skin (epidermis) to separate from the underlying layers. Fluid, usually a clear serum, then accumulates in the space between these layers.

  3. Fluid Accumulation: The accumulation of fluid creates a raised pocket on the skin's surface, forming a blister. This fluid serves as a cushion to protect the deeper layers of skin from further damage.

  4. Pain and Sensitivity: Blisters can be painful or tender, as the separation of skin layers and the pressure from the accumulated fluid can irritate nerve endings in the skin.

  5. Healing Process: Over time, the body will naturally reabsorb the fluid and the separated layers of skin will reattach and heal. In some cases, the blister might break open, exposing the raw skin underneath. This can increase the risk of infection, so it's important to keep the area clean and protected.

How can you treat Athlete's Foot?

To care for a blister:

  1. Leave It Intact: If the blister is intact and not causing severe discomfort, it's generally best to leave it alone. The fluid inside is protecting the healing process.

  2. Cover It: You can cover the blister with a clean, sterile bandage to protect it from further friction or irritation.

  3. Puncture Carefully: If the blister is very large or causing significant discomfort, you might consider draining it. However, puncture it carefully using a sterilised needle after cleaning the area. After draining, keep the area clean and covered to prevent infection.

  4. Prevent Infection: Keep the area clean and watch for signs of infection, such as increased redness, swelling, warmth, or discharge. If infection is suspected, seek medical attention.

  5. Avoid Picking: It's important not to pick at the blister or peel off the overlying skin, as this can increase the risk of infection and slow down the healing process.

Remember, if you have concerns about a blister, especially if it's large, painful, or shows signs of infection, it's best to consult a medical professional for proper advice and treatment.


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Routine Podiatry includes all methods of managing your foot health including nail managment, hard skin, callus, corns, dry skin, cracked heels, diabetic foot check, fungal nail and skin infections, blisters and pressure points.

This also includes an assessment of your vascular status.

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