Wrinkles are a natural part of ageing process. With the ageing of the skin, the levels of collagen and elastin decrease. As a result of this, the elasticity of skin and its ability to stretch become limited. The hyaluronic levels decrease, which gives volume and moisture to the skin. This causes the appearance of lines and wrinkles on the skin. External factors such as sun exposure, alcohol intake, and unhealthy diet etc. increases skin cells ageing which contributes to the formation of even more lines and wrinkles. These lines and wrinkles initially form when you smile or make expressions such as squinting, frowning etc. But if they are not treated, they become deeply etched into the skin appearing even when your muscles are at rest.
