Corns and calluses are caused by friction and pressure when the bony parts of your feet rub against your shoes. If you have corns or calluses, see your doctor. Sometimes wearing shoes that fit better or using special pads solves the problem. Treating corns and calluses yourself may be harmful, especially if you have diabetes or poor circulation. Sometimes these medicines reduce the need for surgery, but check with your doctor before using them.
Warts are skin growths caused by viruses.
They are sometimes painful and, if untreated, may spread. A doctor can apply medicines, burn or freeze the wart off, or take the wart off with surgery. Bunions develop when the joints in your big toe no longer fit together as they should and become swollen and tender. Bunions tend to run in families. If a bunion is not severe, wearing shoes cut wide at the instep and toes, taping the foot, or wearing pads that cushion the bunion may help the pain.