Warts are usually harmless, but may be unsightly. Warts on the feet are called verrucas and are sometimes painful. Warts and verrucas usually clear in time without treatment. If required, they can often be cleared more quickly with treatment. For example, by applying salicylic acid, or by freezing with liquid nitrogen or a cold spray, or by covering with tape. Verrucas, or plantar warts, affect the feet. Plantar warts grow into the sole of the foot and can cause pain on walking