You need a moisturizer because without one your skin will begin to over produce oil to compensate for the dryness causing more breakouts. The key is to find the right one for you. I have used everything imaginable for 20+ years and my best advice is this: Cleanse thoroughly but gently, tone and moisturize. If u need an acne treatment I recommend benzoyl peroxide 2.5%. 5% can be too drying thus causing the overproduction again. Determine your skin type and get the appropriate products.