Before treating your skin with a serum or mask, it's helpful to exfoliate. Exfoliating will reduce the dead-skin buildup that can inhibit product penetration. To exfoliate, first dampen the skin. Then use a pea-sized amount of scrub, massaging it onto the face in circular motions, starting with the forehead and moving down to cheeks and onto chin. Don't forget the creases in the nose. You should exfoliate two to three times a week.