Blisters are usually caused by your footwear rubbing excessively against your skin. Tight shoes can increase pressure on your feet; loosely fitting footwear can result in greater movement and friction inside your shoes.

The friction separates the upper layers of the skin and this rupture forms a pocket that quickly fills with liquid. This liquid filled pocket is what gives the blister its bubble-like appearance

How your skin reacts to friction and shearing forces can depend on the duration and intensity. High forces over a relatively short period of time are likely to result in a blister, whereas lower forces over a prolonged period will result in thickening of your skin and you may develop a corn or callus.

 

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