The common causes of neck wrinkles include skin aging, subcutaneous tissue atrophy, obesity, and poor posture. 1. Skin aging: usually, with age, the skin will gradually aging, the collagen and elastin in the neck skin gradually lost, synthesis is reduced, the skin will become thin, loose, local formation of folds, neck lines, and the older you are, the more neck lines, the deeper. 2. Subcutaneous tissue atrophy: generally due to a variety of factors, such as psychological and mental factors, environmental factors, ultraviolet radiation, smoking, etc., are prone to damage the collagen in the skin, resulting in excessive loss of collagen, connective tissue atrophy, skin sagging neck lines. 3. Obesity: obese people, the neck will have fat accumulation, easier to form neck lines. 4. Bad posture: If you have a long-term low head posture, it is easy to cause the skin of the neck to be frequently pulled and folded, resulting in part of the fibrous tissue fracture, thus appearing neck lines. Usually neck lines do not affect the health of the body, it is recommended that patients according to their own situation, if you need to improve the neck lines, you can go to the regular hospital dermatology department for consultation and treatment.