Low-Level Light Therapy for Cosmetics and Dermatology

Low-level laser (or light) therapy (LLLT), phototherapy, or photobiomodulation refers to the use of photons to alter biological activity. Nonthermal, coherent light sources (lasers) or noncoherent light sources consisting of filtered lamps or lightemitting diodes (LEDs) are used in this type of therapy for reducing pain and inflammation, augmenting tissue repair and regeneration, and preventing tissue damage (Chung et al. 2012; Gupta et al. 2012). In the last few decades, nonablative laser therapies have been used increasingly for the aesthetic treatment of fine wrinkles, photoaged skin, and scars, a process known as photorejuvenation. More recently, they have also been used for inflammatory acne (Seaton et al. 2006). Their potential use for other dermatological conditions and cosmetics such as vitiligo, psoriasis, photoprotection, hair regrowth, and fat reduction has been shown by several studies. In this chapter, we will briefly mention about these cosmetic and dermatological applications of LLLT, starting with its current and potential use in cosmetic dermatology and various skin conditions, hair loss treatment, and lastly fat reduction procedures and cellulite treatment.