There are many reasons for wrinkles on the face, including aging, rich facial expression, skin photoaging, and bad habits. 1. Aging: As human skin grows older, the collagen inside the skin can be gradually lost, thus causing the reduction of skin elasticity, subcutaneous fat atrophy, the face can appear slack and the phenomenon of wrinkles, and the older the wrinkles are, the more wrinkles there are. 2. Excessive facial expression: some people have rich facial expression or often make some strange expressions, which can intensify the contraction of local expression muscles, so it can also cause wrinkles to increase. Such wrinkles are mostly dynamic wrinkles in the early stage, i.e., they appear only when they make expressions, and then they can progress to static wrinkles as they get older. 3. Skin photoaging: If you go out more often, and poor sun protection measures, long-term exposure to ultraviolet radiation, as well as collagen degradation, can also accelerate skin photoaging, the cause of which corresponds to the small facial wrinkles. 4. Bad habits: some people have a chaotic work and rest schedule, or prefer spicy and stimulating food, which can have a certain impact on the skin of the face, leading to bags under the eyes, dark circles and the appearance of fine wrinkles. So if you want to prevent the appearance of wrinkles, pay attention to do a good job of daily sunscreen work and maintain a good routine.