A callus is an area of thick skin that forms due to pressure , friction or irritation . Repeated contact is needed for them to form. Calluses are often found on one's feet because of walking and badly fitting shoes . Though they may appear unsightly, calluses are not usually harmful. They can, however, lead to or cause other problems if neglected.

Calluses can also form on human hands . In particular, the middle, ring and index fingers are prone to calluses. ^[1]

Construction work , having high heels on too much, rock climbing and playing musical instruments can cause calluses on the hands or feet. Certain sports can also cause calluses.

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