This commonly involves th skin on the hands, feet and knees.
Pressure causes cells in the irritated area to grow at a faster rate, leading to overgrowth.
Corns are usually 4mm to 10mm in diameter and have a hard center. The areas most commonly involved are feet, hands and knees. Calluses on the soles of the feet are the most troublesome. Those with occupations that involve pressure on the hands and knees, such as carpenters, writers, guitar players, or tile layers. Don't wear shoes that fit poorly.