In red light therapy, you expose your skin to a lamp, device, or laser with a red light. It uses an LED (light-emitting diode) that emits the correct spectrum of light. Red LED light travels deeper into the skin than blue LED light, which is sometimes used to treat skin surface conditions such as acne. When the light enters your skin, your mitochondria soak it up and make more energy, which helps cells repair themselves.
Red light therapy uses very low levels of heat and doesn’t hurt or burn the skin. Unlike the light used in tanning booths, it doesn’t expose your skin to damaging UV rays.
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Benefits may include:
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Reducing pain
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Increasing blood circulation to the tissue
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Reducing inflammation in cells
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Improving wound healing
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Source: https://www.webmd.com/skin-problems-and-treatments/red-light-therapy