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“LED” means “light emitting diode.” An LED is a computer chip encased in resin that emits a specific wavelength of light energy. Light treatments have been used for many years in hospital settings to speed the healing of wounds. The same concept is now used in the field of aesthetics and skincare. Also called a “photofacial” or “photorejuvenation,” specific wavelengths of light produce beneficial natural reactions in the deeper layers of the skin.