For Chinese people, white is beautiful, so many beauty seekers have tried all kinds of methods to become beautiful. To determine whether a person is white or not, it is mainly based on the amount of melanin particles produced within the epidermis of the skin. Melanin is synthesized by melanocytes, and human melanocytes are transformed from the precursor cells in the embryonic neural crest. Melanocytes are mainly distributed in the basal layer of the skin epidermis and the outer heel of the hair follicle, followed by the mucosa, choroid, retina, soft brain membrane, gallbladder, ovaries, etc. They are a kind of glandular cells. Melanocytes synthesize and secrete melanin, which is actually a protein found in every human body, and the process of melanin biosynthesis is extremely complex. How is melanin produced? The melanocytes that are initially released by the melanocytes do not have any color. The newly generated melanocytes automatically produce a substance called melanin pigment, and when UV rays hit the skin, the skin is in a state of “self-protection”, as the UV rays stimulate the melanin pigment and activate the tyrosinase activity to protect our skin cells. The reaction of tyrosinase in the body produces a substance called “dopa”. Dopa is actually the precursor of melanin, which is oxidized by tyrosinase to form melanin. What does melanin do? Melanin protects the dermis and deeper tissues from UV damage by blocking and reflecting UV rays. On the other hand, melanin synthesis prevents the synthesis of vitamin D in the skin, which is a key substance to promote calcium absorption and therefore rickets is more common in malnourished black children. Laser treatment can be used for skin problems caused by melanin production. Laser technology uses a specific range of wavelength electromagnetic waves, through the synergistic effect of electromagnetic waves, mainly for black and coffee pigments, pigmentation, the combination of light and pigment, so that it is broken down, when the pigment is gradually absorbed by the body, the color of the pigment will then become lighter, to improve the skin texture effect. Aesthetic plastic surgery is a very strict medicine, which has strict requirements on the doctor’s skillful operation and professional aesthetic ability, therefore, we must be careful when choosing a hospital.