Rough hard bump. Usually appears as a rough thick hard bump, can be tender. Tends to occur on tops or sides of toes, bottom of feet in areas where there's rubbing or friction or weight-bearing.
Sometimes painful. There are different types of corns. A hard corn is firm and thick. It may have a soft yellow ring with a gray center. A soft corn looks can look like an open sore. Corns may be asymptomatic, but they can cause pain while you are walking or wearing shoes, and they may make it hard for your feet to fit in your shoes. Pressing or squeezing the corn may also cause pain.