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What are foot blisters, and what causes them?

A blister is a bubble of fluid that forms beneath a thin layer of dead skin. The blister fluid is typically made up of water and proteins.

Foot blisters are commonly seen in people who live an active lifestyle. When your shoes rub against the skin on your foot, the resulting friction leads to the development of a blister. This is because the friction causes your skin layers to separate away from each other, allowing fluid (serum) to fill the separation.

Hot or moist skin increases the force of friction, so sweaty feet can also increase the likelihood of developing a blister.

A man with his foot raised on a step, tying his running shoe with setting sun in the background