“LED stands for Light Emitting Diode,” says Deanne Mraz Robinson, MD, FAAD, assistant clinical professor of dermatology at Yale New Haven Hospital and co-creator of Pure BioDerm. It involves exposing your skin to various wavelengths of light, including red and blue, to address a wide range of concerns.

“Anti-aging — fine lines, wrinkles, collagen synthesis,” Robinson lists. “Acne — bacteria reduction and sebum regulation — and inflammation, including acne, rosacea, and psoriasis.”

It’s also got a pretty hi-tech background. “LED was created for NASA,” says third-generation aesthetician Angelina Umansky, who co-founded San Francisco’s Spa Radiance along with her mother Galina more than 4 decades ago.

You can also book an LED session alongside another treatment. Robinson notes that it works in combination with facials, microneedling, RF (radiofrequency treatments), or other energy/laser treatments.