Corns and calluses are hard, thickened areas of skin that form as a result of friction or pressure on the skin. Corns and calluses develop naturally to help protect the skin underneath them.
Calluses can develop anywhere on the body where there is repeated friction, such as a guitar player’s fingertips or a mechanic’s palms. Corns develop due to bone pressure against the skin. They are common on the tops and sides of the toes and on the balls of the feet. Corns can be hard and dry or soft and mushy. Common causes of corns are arthritis or poorly-fitting shoes.