Everyone wants lit-from-within, glowy skin, but who has time (or money) for spa appointments every week? That's exactly why red light therapy masks are having a full-on beauty moment. Originally beloved in spas and dermatologist offices for their skin-reviving powers, these glowing gadgets are now going mainstream - and for good reason. The concept is simple: gentle, non-invasive LED light penetrates your skin to stimulate collagen, boost regeneration and soothe inflammation, helping you fight fine lines, dullness and uneven tone without ever leaving your bathroom.