What Causes of Blisters on the Feet?
Friction and Pressure
Wearing shoes that are too tight, loose, or poorly designed is a leading cause of blisters. Activities such as running, hiking, or standing for long hours can also create friction that irritates the skin and leads to fluid buildup. Blisters on the bottom of the feet are especially common among runners and individuals who walk long distances.
Heat and Burns
Blisters can develop from exposure to high temperatures, including walking barefoot on hot pavement or sunburns. These blisters typically appear quickly and may be accompanied by redness and tenderness. Water-filled blisters can form in these situations as the skin reacts to the heat.
Allergic Reactions or Irritants
Contact with certain chemicals, plants, or materials can trigger an allergic reaction, resulting in blistering. Common examples include poison ivy or reactions to harsh detergents. Itchy blisters may arise due to these irritants and are often localized to the area of contact. (Source)
Medical Conditions
Blisters may sometimes be a symptom of an underlying condition:
- Athlete’s Foot: This fungal infection can lead to itchy, red skin and, in severe cases, fluid-filled blisters. Learn more about Athlete’s Foot and its treatment options.
- Dyshidrotic Eczema: Small, itchy blisters often form on the edges of the toes and fingers, triggered by stress or allergens. These blisters are usually filled with clear fluid and can be quite uncomfortable. (Source)
- Bullous Pemphigoid: A rare autoimmune disease causing large, fluid-filled blisters, primarily in older adults. These blisters are often found on the lower limbs, including the feet. (Source)
- Hand, Foot, and Mouth Disease: A viral condition causing painful blisters, mostly in children. The blisters can appear on the soles of the feet and may be accompanied by fever or other flu-like symptoms. (Source)
- Chickenpox and Shingles: These viral infections create clusters of itchy, sometimes painful blisters that can appear anywhere on the body, including the feet. (Source & source)
For unexplained blisters that persist or recur, consulting a healthcare professional can help identify potential underlying causes.
