How it works LED light therapy has an established history of skin uses. It was first used by the U.S. Navy SEALs in the 1990s to help heal wounds quickly and to help regenerate damaged muscle tissues. Since then, the treatment has been researched for different frequencies in aesthetics. It’s mainly noted for increasing collagen and tissues, all of which can smooth out your skin and reduce the appearance of damage from age spots, acne, and wrinkles. There are different frequencies, or wavelengths, used with LED light treatment. These include red and blue light frequencies. They are readily absorbed into the skin without containing harmful ultraviolet rays.