Incorrect Size Shoes
The foot can continually rub against the side of the shoe if the shoe is too small – or if too large, the foot will slide around too much. Either type of friction can cause blisters.
Improper Socks
If the sock is too large or small or composed of an irritating material – blisters can result. Not wearing any socks can also lead to the type of friction that causes blisters.
Foot Structure
An enlarged or prominent part of your foot, such as a bunion or hammer toes, can press against the shoe and cause friction.
Excessive Moisture
Running or exercising in shoes damp from water, sweat or rain, can cause the foot to again slide around and result in friction – and blister.
Running Surfaces
Friction from running on a hot surface, such as an asphalt street in the heat of summer, can lead to blisters. Simply switching to a different surface, such as a new track can also cause blisters.
