Corns and Calluses

Corns and calluses facts
- Corns and calluses are annoying and sometimes painful skin conditions that consist of thickenings in the skin in areas of repeated pressure.
- Symptoms and signs of corns and calluses include
- Corns and calluses are foot problems that can be treated with many types of medicated products to chemically pare down the thickened, dead skin.
- Salicylic acid is the ingredient used in most corn and callus removal products.
- Corns and calluses can be prevented by reducing or eliminating the circumstances that lead to increased pressure at specific points on the hands and feet.
- People with fragile skin or poor circulation in the feet (including many people with conditions such as diabetes or peripheral arterial disease) should consult their health care professional as soon as corns or calluses develop.

What are corns and calluses?
Corns and calluses are annoying and potentially painful conditions that form thickened areas in the skin in areas of excessive pressure. The medical term for the thickened skin that forms corns and calluses is hyperkeratosis (plural=hyperkeratoses). A callus refers to a more diffuse, flattened area of thick skin, while a corn is a thick, localized area that usually has a popular, conical, or circular shape. Corns, also known as helomas or clavi, sometimes have a dry, waxy, or translucent appearance. A callus is also known as a tyloma.
Corns and calluses occur on parts of the feet and sometimes the fingers. Corns are often painful, even when they are small. Common locations for corns are
- on the bottom of the foot (sole or plantar surface), over the metatarsal arch (the "ball" of the foot);
- on the outside of the fifth (small or "pinky") toe, where it rubs against the shoe;
- between the fourth and fifth toes. Unlike other corns that are firm and flesh-colored, corns between the toes are often whitish and messy; this is sometimes called a "soft corn" (heloma molle), in contrast to the more common "hard corn" (heloma durum) found in other locations.

What causes corns and calluses to develop?
Hyperkeratosis simply means thickening of the skin. This thickening occurs as a natural defense mechanism that strengthens the skin in areas of friction or excessive pressure. Abnormal anatomy of the feet, including foot deformities such as hammertoe or other toe deformities, can lead to corn or callus formation, as can bony prominences in the feet. Footwear that is too short or too tight or that exerts friction at specific points is also a common cause of skin thickening that leads to corns and calluses. Abnormalities in gait or movement that result in increased pressure to specific areas can also be the cause.
It can be hard to know why finger corns develop since they often don't appear at sites of obvious pressure or rubbing. Finger calluses may develop in response to using tools, playing musical instruments such as the guitar, or using work equipment that exerts pressure at specific sites.

What are risk factors for corns and calluses?
As mentioned above, any condition or activity that results in increased friction over the fingers or toes can lead to the development of corns or calluses. People of all ages can be affected but they are particularly common in people over 65 years of age. Corns and calluses have been shown to affect 20%-65% of people in this age range. Some of these risk factors are
- abnormalities in the anatomy of the feet or toes;
- abnormalities in gait;
- bunions;
- poorly fitting shoes;
- using equipment, tools, or instruments that exert pressure on specific locations on the fingers; and
- certain occupations, such as farmers or garden workers.

What are symptoms and signs of corns and calluses?
Corns and calluses are
How do health care professionals diagnose corns and calluses?
The diagnosis can be made by observing the characteristic changes in the skin. Specialized tests are not necessary.