The difference between dull skin and glowing skin is right on the surface. The most common cause of dull complexion is a decreased rate of cell turnover. Exfoliation helps the skin look its freshest by refining the surface and restoring its natural radiance. Everyone can benefit from this vital step of removing dead skin cells, which results in a smoother complexion. Exfoliation also allows better penetration of treatment products and moisturizers. Always remember to use your sunscreen in conjunction with any kind of exfoliation, because the new skin you expose is especially vulnerable. How often you exfoliate depends on how your skin looks. If your skin looks dull or if makeup catches on your skin as you apply it, you need to exfoliate. Some people make it a part of their daily skin care regimen, and others do it no more than twice a week - the minimum which is recommended.
choices: masks and scrubs, ahas (alpha hydroxy acids) and bhas (beta hydroxy acids),
I personally use Clinique Clarifying lotion and exfoliate my skin daily.