Calluses often appear on the feet, but friction and pressure can also cause calluses on the hands. People who frequently cycle or use hand tools without wearing gloves can develop them. Repeated kneeling or resting elbows on a table can cause calluses on the knees or elbows. Bunions, hammertoe and other foot problems and deformities increase the risk of corns and calluses. A bunion is an abnormal, bony bump that develops on the joint at the base of the big toe. A hammertoe is when a toe becomes curled up like a claw.
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