The causes of skin laxity are aging, bad habits, excessive weight loss, sun exposure and so on. 1. Aging: this is the most important cause of skin laxity, as age increases, the skin contains elastic fiber protein, collagen slowly decreases, subcutaneous fat physiological atrophy, skin laxity phenomenon is becoming increasingly serious. 2. Bad habits: long-term smoking, late at night, alcoholism and other bad habits, destroying the normal structure and function of the skin, it is easy to appear skin laxity phenomenon. 3. Excessive weight loss: excessive weight loss, subcutaneous fat, muscle loss rapidly, the skin loses its support in the short term, it is easy to slacken. 4. Sun exposure: when the skin is exposed to sunlight for a long time, the structure of the skin will be affected by the change of the skin’s photo-aging, which will also cause the phenomenon of skin laxity. Skin laxity is something that everyone experiences. If you are not satisfied with the skin laxity, you can go to the plastic surgery department of the regular hospital to consult a specialist to improve the method.