What is it? - Duofilm is a solution for application on the skin for the treatment of warts, corns and calluses on hands and feet for adults and children aged 4+. Who should use it? - Those who have skin conditions such as warts and corns. How to use it? - Using the applicator provided, apply a thin coat of the medication (one drop at a time) to cover the entire wart, corn, or callus. - To minimize irritation, be careful not to get the liquid on surrounding skin. Let dry. - Repeat this procedure 1 to 2 times daily as needed until the wart, corn, or callus is removed.