Wrinkles are caused by sun damage, loss of volume, and progressive changes to the skin through continual muscle movement, like smiling!
Wrinkle information and treatment tips
There are two important substances of the skin that play a role in wrinkle formation, collagen and elastin. If you were to look at skin under a microscope, you could witness changes in the amount and organization of these substances over time. Aside from genetic predisposition and aging, factors like sun exposure, smoking, and perhaps even conditions such as air pollution can accelerate the loss of collagen and elastin.