Answer: Ingredients and testing. Many less expensive acne scrubs contain ingredients that are “natural” but too harsh for the skin. Some popular brands use ground nut shells or ground fruit seeds as their cleansing particles. While your skin may feel smoother, the long term effects can damage the skin. Physician dispensed brands, like Vivite, are backed by medical research, testing and clinical trials to ensure purity, quality and long term skin health. Not everyone benefits from a scrub. Chelsea Skin & Laser, your dermatologist in 10011, can guide you to the proper products and frequency of use to best suit your needs.