Gently Used a handful of times during my pregnancy! Works perfectly but thankfully my acne is under control and I no longer need to use. From the manufacturer: Acne is a stubborn problem no one should have to deal with! Eliminate it with the QuasarMD Blue. Our LED blue light technology works by killing acne-causing bacteria that lives on the surface of your skin and deep in the pores. By destroying this bacteria, existing breakouts are cleared up and future blemishes are prevented. It’s time to take control of your skin! Dermatologist recommended for clearing stubborn acne Drug and chemical free with zero side effects or downtime Large 2” treatment head for shorter treatment time Medical grade aluminum construction for lifetime durability FDA-cleared and safe for all skin types