Corns and calluses
Corns and calluses are areas of thickened skin that develop to protect that area
from irritation. They occur when something rubs against the foot repeatedly or
causes excess pressure against part of the foot.
Corns and calluses are not contagious but may become painful if they get too
thick. In people with diabetes or decreased circulation, they can lead to more
serious foot problems.
Corns often occur where a toe rubs against the interior of a shoe. Excessive
pressure at the balls of the feet—common in women who regularly wear high
heels—may cause calluses to develop on the balls of the feet.
People with certain deformities of the foot, such as hammer toes, are prone to
corns and calluses.
Corns and calluses typically have a rough, dull appearance. They may be raised or
rounded, and they can be hard to differentiate from warts. Corns or calluses
sometimes cause pain.