What is a callus and what causes it?
A callus is a build-up of hard skin, usually on the underside of the foot. Calluses are caused by an uneven distribution of weight, generally on the bottom of the forefoot or heel. Calluses also can be caused by improperly fitting shoes or by a skin abnormality. It's normal to have some calluses on the soles of your feet.
From: Blisters, Corns, Calluses, and Your Skin WebMD Medical Reference
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