Circles often black what is the reason for ah, can you tell?

The so-called" black eye" is actually divided into two colors, one is blue black eye, this is due to microvascular venous blood retention; the other is a brown black eye, because the melanin formation and resulting from incomplete metabolism, two black eye causes are completely different. Black eye socket usually occurs in about 20 years, not the normal routine of life people particularly hard to avoid, because of microvascular blood flow within the slow, increase in blood volume and oxygen consumption increased, significant increase in hemoglobin oxygen results, look from appearance, the skin appeared dark shades of blue. Since around the eyes more capillaries, so lack of sleep, eye fatigue, stress, anemia and other factors, can cause eye skin congestion and edema. Black eye is the cause and age is closely related to long-term exposure to the sun, causing the pigment to precipitate in the eye in the course of time, it will form a lingering black eye; in addition, blood retention causing melanin metabolism is slow, there is excessive dry skin, but also will lead to the formation of brown black eye



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