There are many causes of ChuanZiLi, such as aging, too much expression and so on. 1. Aging: with age, the degeneration of physiological functions, skin aging can also occur, resulting in skin laxity, loss of collagen and elastic fibers, so the phenomenon of ChuanZhiLin may appear. 2. Excessive expression: Excessive expression is the main cause of ChuanZhiLin, often do too much expression, will lead to the descending eyebrow muscle, frowning muscle too much contraction, so it will gradually form muscle memory, produce ChuanZhiLin. There are many reasons for ChuanZhiLin, if you feel that ChuanZhiLin affects your personal beauty, we suggest that you go to the hospital in time to take formal treatment.