You should be aware of the importance of foot hygiene. While bathing, we often tend to ignore our feet and only apply soap from the ankles up. Your feet need a wash just as much as the rest of your body does. So make sure you wash your feet well.
Keep a pumice stone in the bathroom and every two or three days, soap your feet and scrub them with the stone, paying extra attention to the heels. Take care to rinse of all soap, and dry feet thoroughly, wiping between the toes.