Benzoyl peroxide is a well-known and talked about ingredient for fighting acne.It is available in over-the-counter cleansers, spot treatments, gels, creams and it comes in different concentration in order to meet different severities of acne breakouts.The over-the-counter version is up to 2.5% but there are stronger concentrations and can be prescribed by your dermatologist to treat more severe forms of breakouts.