When it comes to exfoliating I find most people are either over-exfoliating or not exfoliating at all. When you over-exfoliate the skin it can dry out and then over produce sebum to compensate for the dryness. That's when you end up with dry, irritated skin that is still breaking out. When you don't exfoliate blackheads, clogged pores, and a build up of dead skin cells can all occur. Typically you want to use a gentle scrub 1-3 times a week depending on your skin type and the other products you are using. If you use a retinol product you only want to use a scrub about once a week.