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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.

Blisters on feet occur when the foot gets 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 athletes 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.

If a blister is red, leaking yellow fluid or has red lines near the blister, visit a doctor immediately. Redness and leaking yellow fluid are symptoms of infection.