What are Foot Blisters?

Blisters are small swelling of the skin that contains watery fluid. They are caused by friction. The body responds to the friction by producing fluid. The fluid builds up beneath the part of the skin being rubbed, causing pressure and pain.

What causes Foot Blisters?

There are many different causes of foot blisters. Some of the most common causes of foot blisters are:

  • Heat, moisture and friction.
  • Friction forces caused by inappropriate shoes or socks.
  • Fungal infections of the skin.
  • Allergic reactions or burns.
  • Excessive foot perspiration

Blisters occur when feet get hot, sweaty and socks stick to the feet. The sock and foot then rub against each other and the inside of the shoe. Fluid fills up a space between layers of skin to protect the area, like a small balloon. That's how a blister forms.

Blisters are a common problem with wearing in new shoes. They are also a common problem for athletes, runners and walkers who participate in exceptionally long events such as marathons or long hill walks.