Photodynamic therapy in cosmetics

Photodynamic therapy (PDT) is a relatively newer treatment method, driven by light, applicable for treating several health conditions having therapeutic as well as cosmetic implications. Generally, PDT entails illuminating the skin surface and hence it has utility in treating several dermatological conditions. PDT brings an overall improvement to the skin along with desirable esthetic benefits. The three fundamental components of PDT are an optimum light source, a suitable photosensitizing agent, and the reactive oxygen species that are generated as a consequence of illumination. PDT has cosmetic applicability in addressing signs of aging, cancerous skin lesions, microbial infections, scarring, hair loss, and much more. Given its wide scope of applicability, PDT stands to create its own niche clinically as a treatment approach provided that, complementary progress of its components, pertaining to their structural modifications, safety, novel delivery techniques, treatment durations, etc. go hand-in-hand. This chapter aims to outline the cosmetic applications of PDT pertaining to several diseased conditions that affect the skin, along with highlighting the interplay of several factors influencing its efficacy and future development.