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 Are Foot Calluses? Foot calluses are thick patches of skin that can be dark in color or dusty and cracked in texture. Many people have calluses on their feet. Calluses most commonly form on the knuckles of the toes or on the heels and balls of the feet. The affected areas can feel rough and take on a dry appearance. Calluses are basically dead skin that has hardened over softer portions of the skin.