Acne outburst takes place with Propioni bacteria which cannot survive in an oxygen-rich environment. Benzoyl peroxide introduces oxygen into the pore, and leads to killing of the bacteria. This leads to reduction of bacteria which in turn leads to reduction in skin as well. Benzoyl peroxide also helps get rid of follicle of surplus dead skin cells which clears the pore and reduces the chance of pore blockage. It is recommended to continue using these acne products despite the reduction of acne, as there are chances that acne may come back. Hence a good dermatologist will guide you better in the use of these products.
There are some side effects associated with these such as dryness, burning, redness and peeling. These side effects can be minimized with by use of an oil-free moisturizing lotion on a daily basis. It's vital that the products should be used only as advised and by following the directions given. Else the skin problems may get aggravated. Usually these products should be applied to a clean and dry skin, either once or twice in a day.
You must begin by using acne products with lower strength which permits your skin to adjust to these treatments. Only if there is no visible positive outcome, should you scale up to higher dosage. The lotion should be applied thoroughly on the areas which are impacted. Since these products have bleaching effect, you may want to let the lotion dry up before coming in contact with any other material.