What is it?
When we walk or stand, our body weight is carried first on the heel and then on the ball of the foot, where the skin is thicker, to withstand the pressure. When this pressure becomes excessive, some areas of the skin thicken, in the form of corns and callus, as a protective response.
A callus, or callosity, is an extended area of thickened skin on the soles of the feet, and occurs on areas of …