The neck is an "eventful triangle" in ergonomics. The skin on the neck is very thin and fragile. The number of sebaceous glands and sweat glands in the skin in front of the neck is only one third of that in the face. Sebum secretion is less, it is difficult to moisturize and it is easier to dry, so it is easy to produce wrinkles. There are usually two kinds of wrinkles on the neck. One is the wrinkles of early aging, which began to appear in the teens. This kind of wrinkle is usually not obvious. Another wrinkle is affected by ultraviolet rays and deepens with age. This wrinkle may be very obvious. Countless movements of raising the head and lowering the head, together with the weight of supporting the head, can easily accelerate the aging and relaxation of the neck skin and produce wrinkles. Moreover, once wrinkles are produced, it is difficult to restore elasticity and eliminate them. Many women pay great attention to the maintenance of "face", but ignore the neck skin and pay little attention to nursing, so some girls have obvious wrinkles on their necks since they were 25 years old. If you are older, the neck skin has been slack and dehydrated, and the sense of contour has decreased, which requires targeted neck maintenance. Because the neck is also a place for regular exercise, wrinkles are very easy to appear with age. Therefore, in most cases, the neck appears to age faster than the face. Simple neck rhytidectomy is rare, but it is usually performed together with surgery to tighten the neck skin. In addition, in addition to the wrinkles on the neck, the boundary between the neck and chin will become blurred due to the sagging skin of the neck. If this happens, it will appear more aging, so it is also an important process to clarify this boundary. After middle age, due to the accumulation of subcutaneous fat, the boundary between neck and mandible becomes more blurred. In this case, liposuction at the same time can achieve a more perfect cosmetic effect.