Exfoliation
The point of exfoliation is to remove dead skin cells from the treated area, and this helps to give skin a fresher, healthier appearance.  Exfoliation can be done using products such as micro-beads found in facial scrubs, sugar (often found in DIY recipes), or even something like a loofah (they even make loofahs strictly for the face).  Typically, these types of products are found at your local drugstore or cosmetic counter.  There are stronger exfoliants that are scrubs containing sailcylic acid, glycolic acid, etc., and these are usually found in lower concentrations for products you can readily get, but often available in higher dosages by dermatologists.

Source