Risk factors

These factors may increase your risk of corns and calluses:

• Bunions. A bunion is an abnormal, bony bump that forms on the joint at the base of your big toe.
• Hammertoe. A hammertoe is a deformity in which your toe curls like a claw.
• Other foot deformities. Certain conditions, such as a bone spur, can cause constant rubbing inside your shoe.
• Not protecting your hands. Using hand tools without wearing gloves exposes your skin to excessive friction.