"First I must say that chemical peels for skin can clear acne in as little as 8 weeks, but the use of Benzoyl Peroxide is very effective at the prevention of new acne." Master Esthetician Patricia at Red Lotus Skin Care in Beaverton, talks about pimples and acne. "P acnes bacteria is found in our skin normally but if the skin can not get enough oxygen because of clogged pores with sebum (oil) and dead skin cells, the P acnes grows out of control and a pimple develops. A simple application nightly of Benzoyl will oxygenate skin and prevent the growth of this bacteria. A very important note to remember is skin become resistant to over the counter Benzoyl sold at 2.5% and only 5 to 10% will do the job consistently. My favorite is Jan Marini's Duality, a Retinol and Benzoyl combo that is really the best one product for acne combined.