What is the best exfoliant/scrub for very dry, acne-prone skin? how often should i use it?

Face cloth: A clean course face cloth with warm water and a ph balanced soap works beautifully. Be sure to launder them frequently and dry thoroughly to avoid mildew and use a fresh one every day.

Exfoliant: Alpha-hydroxy acids, such as glycolic and lactic acid, peel off the top layer of the skin. This removes dead skin cells and other pore-clogging debris. Scrubs containing alpha-hydroxy acids can reduce cystic acne and prevent new lesions from forming.