Skin pigmentation is a serious problem for many people, especially young women. In life, UV rays from the sun play a vital role in skin pigmentation. But the damage is slowly accumulated, and the formation of pigmentation on our face is inseparable from UV rays. In the summer, let’s understand how the formation of blemishes on the face is closely related to UV rays. Darkening is the skin’s self-protection The skin is able to synthesize melanin, which plays a role in protecting our cells from damage. If the synthesis capacity is reduced, the skin becomes weak and vulnerable to damage. This is one of the reasons why the incidence of skin cancer is higher in many European countries than in black Africans. UV stimulation leads to melanin production Pigment mother cells exist in the epidermis of every human skin, which secrete pigment precursors. When UV light hits the skin, the skin is in a state of “self-protection” and when stimulated by UV light, it activates the activity of tyrosinase, which releases melanin to protect our skin from damage. Under normal circumstances, if the melanin produced is broken down and peeled off normally during the metabolic process, it will not affect the skin tone. Once the metabolism in the body is disordered, when the sun is exposed to the sun or when the endocrine changes, these melanin cannot be metabolized in time, it will be precipitated in the basal layer of the epidermis, making the skin color darker; if it is only locally precipitated, it will form spots or deepen the color of the original spots, which is the sun spots. Clinical manifestation of sun spots Shape: oval, raised or smooth, with irregular boundary; Color: dark brown mainly, but also light brown; Location: easy to appear in most areas of the face and exposed parts such as arms and calves; Symptoms: painful and itchy at the beginning, peeling skin, forming discoloration at the later stage. Photoaging is more terrible than sun spots UVB (medium-wave ultraviolet) – sun redness and tanning has a short wavelength and has an erythematous effect on the human body, and long-term or excessive exposure will cause skin tanning and redness and peeling. UVA (long-wave ultraviolet) – directly cause photoaging penetration is very strong, can directly reach the dermis, destroy elastic fibers and collagen fibers, resulting in skin loosening, wrinkles and other photoaging problems. At the same time, it can activate tyrosinase, leading to immediate melanin deposition and new melanin formation, making the skin darker and lacking luster. Daily protection 1. In addition to the use of high index sunscreen, usually you can also use sunscreen index 15 + foundation or BB cream; 2. sun hat in the summer can not be missing; 3. summer can go out less out; 4. vitamin A, C, E and selenium yeast has a very good antioxidant effect, more supplement points, can prevent the formation of dark spots.