Use it: If you want the latest preventive treatment—and don’t mind plunking down some cash for it.
How it works: Once or twice a week, you use a handheld device to aim a beam of blue light onto your skin. “Its wavelength hits and kills acne-causing bacteria,” explains Draelos, so any brewing pimples never come to the surface.
Good to know: This method won’t address existing blemishes. Doctors typically suggest combining blue-light therapy with other remedies, such as topical treatments. To make things easy, consider a blue-light device that comes in a kit. At-home devices are smart alternatives to multiple costly treatments at a doctor’s office.