Here are some ways to identify different types of corns and calluses:
A callus is a patch of compact, dead skin anywhere on the body which is subject to friction. There are different common names given to various type of calluses.
A hard corn is a compact patch of hard skin with a dense core, located on top of a toe or the outside of the little toe.
A soft corn is a reddened, tender area of skin, has a thin, smooth center, and is found between toes.
A seed corn...