Red light therapy is the common name for the use of infrared (IR) and visible red (VR) light for therapeutic purposes. At one time, it almost exclusively meant laser treatment but now it has broadened to include LED and other forms of light therapy. VR light is more absorbed in the skin than the deeper penetrating IR wavelength. However, being superficial has advantages for the skin. In dermatology, VR light helps wrinkles, scars, and burns. It can reduce UV damage, help vitiligo, and diseases such as psoriasis and acne. The noninvasive nature and almost complete absence of side effects encourage further testing in dermatology. Semin Cutan Med Surg 2013 Mar;32(1):41-52