Nasolabial fold
The crease that runs from each side of the nose to the corners of the mouth.
Also: smile line, nose-to-mouth line
The nasolabial folds are two lines that run from beside the nostrils down to the edges of the mouth. Everyone has them, even babies: they mark where the cheek meets the upper lip. They deepen when we smile and become more visible with age. Some traditional face-reading systems give them meanings, but these have no basis. Makeup artists may soften them with light-reflecting products; many people leave them as they are.