Calluses and corns are hardened skin that can crack and hurt if they get too thick. During a pedicure, don't let the salon technician use a razor on your feet. Razors raise the risk of infection. At home, soak your feet in warm water for at least five minutes. Then use a foot file, pumice stone, or exfoliating scrub to remove calluses. Don't go barefoot, either -- it can cause calluses.