Corns (also called helomas or clavus) are thick, hard, rough, dead areas on the skin caused by excessive friction or pressure. The most common sites for corns are feet, toes, hands, and fingers. Corns get formed due to excessive friction, rubbing, or pressure on the skin. Corns appear as thick, rough, raised areas on the skin. Corns can either be hard or soft. Hard corns appear majorly on top of the toes or on the sides of the feet while soft corns form in between the toes. They cause pain while walking or standing.