The Wartner Corn & Callus Removal Pen is a medical device for treatment of thickened skin, corns or severe/persistent calluses caused by chronic pressure on the skin. Constant friction (such as by extra tight footwear) can lead to skin cell growth resulting in thick & painful lesions. The wartner corn & callus removal pen contains a highly concentrated gel which causes the skin to peel away. As this occurs, the thickened skin, corn or callus will disappear, & new healthy skin is formed.