There are some signs that can help you differentiate between skin purging and regular breakouts. For example, skin purging usually occurs when you start using a new product that contains ingredients that increase cell turnover, such as retinoids or exfoliating acids. Skin purging also tends to last for four to six weeks, which is the time it takes for your skin to complete a full cycle of cell renewal. Skin purging also tends to occur in areas where you normally have clogged pores or acne, such as the forehead, chin, or nose. On the other hand, regular breakouts can occur anytime, regardless of the products you use. They can also last longer or shorter than six weeks, depending on the cause and severity of your acne. They can also occur in areas where you don't usually have clogged pores or acne, such as the cheeks, temples, or jawline.