LED light therapy is a popular noninvasive skin treatment for acne, sun damage, wounds, and other skin problems. LED stands for light-emitting diode. These lights have been in use since the 1960s, but people have only recently begun to use them as a skin treatment. NASA originally developed Trusted Source LED lights for plant growth experiments in space. However, since then, LEDs have shown promising results in wound healing and human tissue growth. Different wavelengths of light in LED lights, including blue and red, penetrate the skin at different depths. This penetration may trigger biological processes that help the skin rejuvenate and heal.