Why Do I Have a Bump on the Top of My Foot? An injury, corns, callouses, cysts, or other health conditions can cause a bump on your foot. They can be painful and make walking difficult, but there are ...

At first glance, it looks like a wart—but upon closer inspection, a glassy, hard core in the center becomes noticeable: a typical sign of a corn, also known as a clavus. This small, often painful ...

This patient had a clavus, more commonly known as a “corn.” Corns are localized epidermal thickenings caused by repeated friction or pressure. They occur over bony protuberances, usually on the feet ...