First, Stop wearing the shoes, They will add more friction to the corns on your feet, which will not allow them to heal. Apply a salicylic acid pad or disc to the corn, such as Dr. Scholl's Corn Pads These pads are available over the counter from pharmacies and drug stores, and will relieve the soreness on the corn when standing or walking. To avoid recurring corns, continue to wear shoes that fit properly. Try Exfoliating with a pumice stone once a week to keep the skin on the toe soft.
If the corn persists and continues to be painful, see a physician or podiatrist, who may be able to cut out the corn.