Corns and calluses are thick, hardened layers of skin that develop when the skin tries to protect itself against friction or pressure. They often form on feet and toes or hands and fingers.
If you’re healthy, you don’t need treatment for corns and calluses unless they cause pain or you don’t like how they look. For most people, simply removing the source of the friction or pressure makes corns and calluses disappear.
Causes
Wearing ill-fitting shoes and socks. Tight shoes and high heels can squeeze areas of the feet. If your shoes are loose, your foot may repeatedly slide and rub against the shoe. Your foot may also rub against a seam or stitch inside the shoe. Socks that don’t fit right can also be a problem.
Skipping socks. Wearing shoes and sandals without socks can cause friction on your feet.
Playing instruments or using hand tools. Calluses on the hands may result from the repeated pressure of activities such as playing instruments and using hand tools or even a pen.
Inheriting a tendency to develop corns. The type of corn that forms on non-weight-bearing areas, such as the soles and palms (keratosis punctata), might be caused by genetics.
In conclusion, If a corn or callus becomes very painful or inflamed, see your health care provider. If you have diabetes or poor blood flow, seek medical care before self-treating a corn or callus. This is important because even a minor injury to your foot can lead to an infected open sore (ulcer). All informations are gotten from Mayo clinics.