On a larger scale sciatica, piriformis syndrome and other maladies, can cause a numbness in the foot that can take much longer to go away and in some cases never go away. If the sciatic nerve gets impinged at any point on its way from the spinal cord to the foot its effectiveness will decrease. Think of a water hose that you put a crimp into.
A callus (or callosity) is a toughened area of skin which has become relatively thick and hard in response to repeated friction, pressure, or other irritation.Rubbing that is too frequent or forceful will cause blisters rather than allow calluses to form.ormally, a callus will form on any part of the skin exposed to friction over a long period of time. For example, people often develop calluses on the middle finger of their dominant hand due to writing with a pen or pencil.
What is a foot corn and callus (hyperkeratosis): A corn or callus are areas of thickened skin that occur in areas of pressure. They are actually a normal and natural way for the body to protect itself. For example, callus develops on the hand when chopping a lot of wood-its a normal way for the skin to protect itself.orns and callus are one of the most common problems seen by Podiatrists. They can occur on any part of the foot and vary in symptoms from a mild callus under the foot, to an infected ulcer that can develop under a corn on a toe.