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Due to constant friction or pressure of skin rubbing the bony areas of the foot, or due to ill-fitting shoes, one sometimes develops what is called a callus or callosity. After a while, if callus treatment hasn't been successful and if the pressure is extreme, the callus will get thicker and thicker and become what is known as a corn...

When excess fluids accumulate in the body it leads to condition known as edema. There are various types and causes of edema, including hypersensitive edema, cyclic edema, idiopathic edema etc...