How did the spots come about?

First, the formation of black spots 1, sunbathing is the number one killer of spots. The melanin deposition caused by ordinary people in the sun will be discharged with the metabolism of the human body, but some people may have a slow metabolism or be older, leaving melanin and forming black spots. 2. Metal poisoning caused by the use of expired or inferior cosmetics, such as lead, mercury and arsenic poisoning. 3, skin trauma, dust, ink and other foreign bodies embedded in the wound: use iodine, purple liquid: or eat food containing pigments, such as soy sauce, black fungus and so on. , will cause pigment deposition, forming black spots. Second, the formation of freckles 1, genetic factors: but not necessarily inherited from your parents, it may be inherited every few generations. Generally speaking, freckles appear on fair-skinned faces. 2. Exposure: On the one hand, ultraviolet rays in the sun stimulate frequent activities of pigment cells under the skin, producing a large number of melanin pigments; On the other hand, it damages the normal metabolic function of skin cells, so that melanin can not be discharged smoothly and remains on the skin, even deposited in the dermis. Therefore, excessive sun exposure will aggravate and deepen freckles, but freckles will gradually fade in winter. Third, the formation of chloasma is due to the blockage of microcirculation between tissues and cells, cell lysis and death, and increased melanin to form pigmentation. Facial epidermis is the thinnest, capillaries are the richest, and pigmentation is the easiest to form. The pigmentation site is mainly in the basal layer of epidermis, and the melanin particles increase obviously. In more serious cases, there are more melanin in melanophagous cells in dermis. Compared with normal, the number of pigment cells, the formation of melanin and the activity of melanin particles have increased to varying degrees. 1 imbalance of yin and yang in human body: first, facial blood stasis caused by stagnation of liver qi; Second, due to the weakness of the spleen and stomach, qi and blood can not moisten the face, and damp heat rises to the face to form spots; Third, due to the deficiency of kidney yang, yang disperses blood stasis, forming chloasma on the face. After pregnancy, the placenta secretes more androgens and progesterone, so chloasma symmetrically distributed on both cheeks of pregnant women is common, but after the secretion of androgens and progesterone in postpartum body returns to normal, most people's spots will naturally ease or disappear. Drug factors: among women who take oral contraceptives for a long time, 9% ~ 20% are prone to chloasma, and some people even have facial spots after taking oral contraceptives for one month. In addition, taking drugs for hypertension and diabetes and eating more sensitive foods, such as celery, parsley and carrots, are also prone to chloasma. Other factors: Some chronic diseases, such as chronic hepatitis and tuberculosis, will increase tyrosinase activity and melanin production, while the body's ability to eliminate melanin will be weakened. Once melanin cannot be excreted in time, it will also produce chloasma on the face over time; In addition, improper use of cosmetics will aggravate and accelerate the formation of chloasma. Knowing the causes of chloasma, it is not difficult to draw a conclusion that chloasma is a common disease in women, but it is quite rare in men. No wonder female friends loudly protest against God's unfairness!