With dermatologist in-office acne technology, the Neutrogena Light Therapy Acne Mask is a revolution in acne treatment. This face mask harnesses the power of clinically proven technology to clear acne and allow skin to heal itself. Here is how light therapy works. Blue light targets acne-causing bacteria while red light reduces acne inflammation. This one-step acne treatment covers your face and is easy to use at home. After cleansing, put the mask on. Push the button and let it work for 10 minutes. You can sit back and relax until it automatically shuts off. Use it every day and you’ll see clearer, healthier skin with this chemical free and UV free acne treatment.