Home > Medical Terms/Conditions > How Corns & Calluses Form

Corns and Callouses
Callouses and corns form due to repeated friction and pressure, as the shoe rubs against a bony prominence on the toe or foot. The body's natural reaction to the added pressure and friction is to add more layers of skin as protection.
Callouses usually develop under the metatarsal bones (ball of the foot) due to its weight bearing.
Corns are usually caused by misalignment of the toes (hammer toes). Toes can curl under causing the toe knuckle to rub on the shoe.
Abnormal foot structure and improper shoes can aggravate corns and callus. Callus and Corn pads will help prevent them.