Use Neutrogena Rapid Clear Stubborn Acne Daily Leave-on Mask daily to reveal clearer skin. This leave-on mask is clinically proven to reduce the size and redness of current breakouts in just four hours. The gel formula with - benzoyl peroxide acne medicine vanishes instantly into skin, allowing the acne medicine to absorb deep down, killing acne-causing bacteria to fight both your current stubborn acne and the acne forming under the surface of your skin. Unlike traditional masks, this is not a wash-off product. When used morning and evening, this dermatologist-recommended benzoyl peroxide acne medicine allows you to treat acne around the clock so you can keep fighting acne all day for results that last. Safe and gentle enough for daily morning and night use, it won't over-dry, sting, or burn skin and dries clear, so you can use it under your moisturizer or makeup.