Hi I'm Shoni Morris and I'm here on behalf of Expert Village. Now we are going to talk about the difference of the acne medicines. So the first one we are going to talk about is salicylic acid. That is generally going to dry out the pimple and the effected area and kill the bacteria. Now you dont want to put it on the surrounding skin it would over dry it. Benzoyl peroxide it kills the bacteria, it is just a different type. Salicylic kills one type of bacteria which is a gram negative or a gram positive and benzoyl peroxide kills the opposite of what salicylic kills gram negative, gram positive. Hydrogen peroxide kills both of those so it is ideal for the P.M use.