Scholl Callus & Hard Skin Reducing Cream Scholl Callus & Hard Skin Reducing Cream is clinically proven to gently reduce callus & hard skin in 7 days. It contains a natural soothing ingredient, is non-greasy, quickly absorbed, dermatologically tested, perfume free & hypoallergenic. Directions Apply twice a day to the affected areas of the skin on the heels & balls of the feet & gently massage in. Continue use to prevent further callus & hard skin build up.