
Calluses, a layer of dead, hard skin cells, are caused by repeated pressure in one area, prompting the acceleration of the production of skin cells. This barrier is the body's way of trying to protect itself.
In general, corns and calluses are the same, they are both caused by the skin hardening in response to pressure or rubbing. The main difference between the two is that corns are deeper, more localised hardening of skin and calluses tend to cover a wider area at the surface of the skin, and are not as deep as corns.
Calluses are most commonly found on the balls of feet and heels and are yellow/dark brown in colour. They are caused by factors such as high heels, long periods of standing and obesity. In itself, a callus is not harmful, however, they can over time become very painful and can lead to further problems.