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One of the most popular treatments for acne are products containing benzoyl peroxide such as Clearasil and ProActive. Although it is well tolerated by most people there are some side effects known so it is best to be aware of them before starting to use this type of product. Benzoyl peroxide is found in many over the counter preparations including gels, lotions, washes and cleansers and is also available on prescription in higher concentrations.