You just got home from your evening walk and are taking off your shoes and socks. On your left foot, you notice that there’s a hard, raised bump on your heel. You press on the area, but it doesn’t hurt. You ask your doctor about it at your routine visit the following week. After looking at it, she says, you have a callus. What caused it to occur? Can it be removed? What do you need to do to prevent more calluses from forming?