When it comes to over-the-counter (OTC) acne spot treatments, you’re likely to find that many products contain benzoyl peroxide. The problem is, benzoyl peroxide doesn’t work for all types of acne. Benzoyl peroxide works by reducing swelling, which a key marker of inflammatory acne, which includes cysts and pustules. It can also get rid of underlying bacteria in a pimple.
However, blackheads aren’t considered inflammatory. Also, they are not caused by bacteria, so products featuring benzoyl peroxide won’t do much good.