The causes of skin tightening and lifting involve various factors. Firstly, natural factors include age and genetics. As one ages, collagen and elastin in the skin gradually decrease, leading to a loss of skin elasticity, wrinkles, and sagging. Genetics also influence skin traits, with some individuals naturally having tighter skin while others have looser skin.

Secondly, external factors also play a significant role in skin tightening and lifting. UV exposure is one of the primary factors. Prolonged exposure to UV radiation damages collagen and elastin fibers in the skin, accelerating the aging process, causing uneven skin texture, wrinkles, and sagging. 

Lifestyle, diet and environmental factors are equally important impact the skin.