Corns are calloused areas of skin that develop to protect skin from damage against prolonged rubbing, pressure, and other forms of irritation. Calluses and corns typically form on the hands or feet. 

Corns can be caused by certain factors such as wearing too fitted or too loose shoes, not wearing socks, walking barefoot regularly etc. Other risk factors may include joint problems, any other foot-related problems like bunions or hammer toe.

These conditions can be prevented by reducing or removing the causes that lead to increased pressure at specific points on the hands and feet.

Corns can be treated with medicated products to chemically break down the thickened, dead skin. Salicylic acid is usually the main ingredient used in most corn and callus removal products.

People with fragile skin or poor circulation in the feet (due to conditions such as diabetes or peripheral arterial disease) and repeated formation of corns should consult a podiatrist or a healthcare professional for appropriate management.