As a result of continued friction or pressure in a particular area, the skin forms a tough, hard, self protecting layer known as a callus. Calluses are common on the soles of the feet, the palms of the hands and among guitarists and string players on the tips of the fingers. A heavy callus which presses against a bone in the foot because of poorly fitted shoes can be very painful. The hard surface can be reduced somewhat by the use of pumice, or by gently paring it with a razor blade that has been washed in alcohol.
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