Wrinkles are fine and deep lines that form on the skin, usually on the parts that are exposed to the sun such as the face, arms, neck, hands, etc. It is quite a natural part of aging. Despite genetics, which mainly determines skin structure and texture, sun exposure is a major cause of wrinkles, especially for people with light skin. Pollutants and smoking also contribute to wrinkling. If your wrinkles bother you, you have more options than ever to help smooth them or make them less visible. ...