Wrinkles around the mouth are often caused by a combination of volume loss within the skin and depressions from decreased skin elasticity, so it is important to first determine which of these two factors is dominant.
With aging, the fat layer of the mid-face (cheekbones and cheeks) atrophies and descends, causing tissue to accumulate above the nasolabial fold and deepening the groove. At the same time, the structures within the skin around the mouth—bone, muscle, and fat—diminish, causing the skin to sink and making the marionette line (the wrinkle from the corner of the mouth toward the jaw) more prominent.
A simple self-check: if the wrinkle becomes noticeably shallower when you lie down, sagging (gravity) is a significant factor; if the groove remains even when lying down, volume loss plays a larger role. However, since in most cases both factors are mixed, it is more accurate to assess the overall fat distribution and skin elasticity of the face together.
Accurate cause analysis is limited by visual observation alone, so it is necessary to evaluate changes when making expressions versus at rest, skin thickness, and the degree of sagging together.



