The human skin color is mainly determined by the content of melanin in the skin, the lower the content of melanin the fairer the skin will look, and vice versa, it will look dark. The human skin consists of epidermis, dermis and subcutaneous tissue. According to the different stages of cell development and morphological characteristics, the epidermis can be divided into 5 layers from outside to inside: stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum and stratum basale, and melanocytes exist in the stratum basale. Melanocytes account for 4% to 10% of the entire basal cells, which can produce melanin (pigment granules) and determine the shade of skin color. After basal cell division, the time for skin cells to migrate to the stratum corneum and shed is generally 28 days, called turnover time. Therefore, from the medical point of view, if products that can achieve rapid whitening effect in less than 28 days, they must contain certain drug ingredients that are prohibited in cosmetics. Skin whitening and spot removal needs a process, and can only be gradually changed, a few hours or days of “fast whitening and spot removal”, will cause artificial damage to the skin. Quick whitening is “drug addiction plus peeling” In the use of cosmetics with excessive heavy metals, it is true that the skin can look much whiter in a short period of time, and there is also the effect of making spots lighter, all because of the role of the heavy metal components. Mercury compounds will destroy the enzymatic activity of the epidermis, so that melanin can not be formed, a short time to make the skin white, the consequences of heavy metal deposits in the skin can cause chronic poisoning, including liver and kidney damage, tremors, memory loss, visual, auditory function loss and other neurological symptoms, and cause damage to skeletal muscle and bone tissue; lead oxide has a certain masking effect, can also be used for whitening, excessive use can damage the hematopoietic system, nervous system, kidney, immune and endocrine system, etc. On the other hand, these heavy metal ions also cause the skin’s most superficial stratum corneum to exfoliate, and the lower layer of immature skin is exposed, so the skin looks white and tender. The Cost of Quick Whitening In emphasizing quick-acting whitening goods, they often cause irreversible damage to the skin, and mercury damage is the most typical example. Cosmetics that contain too much mercury can make the skin white and tender in the short term, but if you stop using them, the skin will return to its previous state or even worse than before, so it is hard to stop once you use them. In order to maintain a good whitening state for a long time, many people will use it for a long time, not knowing that these seemingly magical chemical ingredients have a strong light-absorbing effect, which will produce abnormal pigmentation on the skin and deepen the original pigmented areas, and at the same time may cause the skin to peel off layer by layer. And because of its exfoliating effect on the skin’s stratum corneum, the skin becomes unusually sensitive, the sun will immediately get a red rash, itchy and hot, and especially easy to dry. Such rapid whitening, you still dare to want? Related notes 1. The heavy metal ingredients (especially mercury and lead) that can make the skin whitening quickly will not only be harmful to the skin, but also cause chronic poisoning when absorbed by the skin and deposited in the body for a long time. Severe cases can lead to damage to human bones, teeth and liver and kidney functions and nerves, with serious consequences. 2, although the higher the content of melanin in the skin, the darker the skin tone will appear, but from the perspective of cancer prevention and skin care, the higher the content of melanin, the less likely to suffer from skin diseases. Because it can absorb most of the ultraviolet rays and greatly reduce the transmission of ultraviolet UVA and UVB rays, thus protecting the skin from biological damage caused by ultraviolet and visible light exposure, protecting and reducing the acute or chronic inflammation of the skin caused by sunlight, effectively preventing sunburn, aging and cancer of the skin caused by sunlight. 3, want to whitening and rejuvenation, it is best to go to the hospital dermatology or regular dermatological medical beauty institutions, listen to the guidance and advice of dermatologists. At present, laser whitening, fruit acid rejuvenation, medical skin care products and other methods can effectively improve the skin tone, so that you are more youthful and beautiful. The usual diet with more food containing vitamin C can also achieve whitening effect. Warm tip: Tzu said: the desire for speed is not achieved. Everything should be done step by step, there will be a quantitative change before the qualitative change, do not be anxious. If you do things in pursuit of speed, against its path, the results will be farther from the goal. Fast whitening is such an example of going against the grain. Therefore, you must be cautious and stay away from fast whitening products that are advertised as having immediate and same-day results.