Skin aging is usually divided into intrinsic and exogenous aging. Exogenous skin aging is also known as skin photoaging because ultraviolet radiation from sunlight is the main factor in environmental factors that cause skin aging. The process of photoaging begins at age 0. The clinical manifestations of photoaging are pigmentation, wrinkles, spots, vascular dilatation and skin laxity, which often appear before the age of 30. Photoaging can further develop into skin tumors, including solar keratosis, squamous cell carcinoma, basal cell carcinoma, etc. 1. Clinical manifestations of photoaging: Occurring in light-exposed areas including face, neck, upper limbs, etc., the manifestations are: (1) pigmentation abnormalities, pigmentation spots or hypopigmentation spots. Some of the pigmentation spots are the common age spots. (2) Dilated capillaries, also known as “facial erythema”. (3) Skin wrinkles, skin sagging, skin furrow deepening, skin crest elevation, leather-like appearance when serious. (4) Skin roughness, pore size, orange peel-like appearance when serious. 2.Treatment methods of photoaging: (1) drugs and cosmetics; (2) surgical treatment; (3) injectable treatment; (4) laser treatment, including exfoliative fractional laser and non-exfoliative fractional laser, among which there are different laser devices such as ultra-pulsed carbon dioxide fractional laser and erbium laser. (5) Intense pulsed light (IPL, the latest technology is OPT technology) – non-ablative and less invasive; (6) Photodynamic therapy (PDT); (7) LED light, such as LED red light.