Since human beings are thermostatic animals with a constant body temperature between 36℃ and 37℃, some people would think that the temperature of the skin is as constant as the body temperature, which is actually wrong. Human tissues and organs and skin with different parts of the body will have a great difference. The body’s liver has the highest temperature, followed by blood vessels and muscles, and finally the skin. Skin temperature is generally lower than 37 ℃, it is affected by the blood circulation within the skin and the external air temperature, the general rule is that the trunk than the limbs, the proximal end of the limbs than the distal end of the high blood circulation is rich in the head, face and palm and plantar skin temperature is also higher, the lowest is the auricle, the tip of the nose and the end of the finger. Changes in external temperature on the skin temperature is also obvious, for example, in summer when the chest skin temperature of 36.6 ℃, the thighs of 33.6 ℃; to the chest in winter for 36.4 ℃, the hand temperature is only 10 ℃ or so, the difference is very significant, the insulation is not appropriate, it is easy to occur frostbite. The microcirculation of the skin has an important role in the regulation of body temperature. When the temperature inside and outside the body rises, the skin microcirculation blood flow increases, the flow rate is accelerated, blood vessel expansion, sweating increases to exude heat; on the contrary, the body heat production is low, the external temperature is low, the skin blood flow decreases, the flow rate slows down, the blood vessel contraction, to prevent from the skin to dissipate heat. Many people believe that drinking alcohol can get rid of cold, which is also not entirely true. Drinking alcohol can make the skin microcirculation blood vessel expansion, blood flow increase, can temporarily play a role in warming the skin to get rid of the role of cold, but at the same time also more accelerated the body heat loss from the skin, once the role of ethanol disappeared, it is more cold, and excessive drinking drunk, the skin microcirculation vasoregulation function paralysis, the resistance to cold is greatly weakened, it is very easy to occur frostbite, frostbite, so do not advocate the use of alcohol to warm up in winter! Therefore, it is not recommended to drink alcohol to warm up in winter, and it is even more important to prohibit drunkenness when going out.