The nasolabial folds, commonly known as `smile lines` or `laugh lines`, are facial features. They are the two skin folds that run from each side of the nose to the corners of the mouth. They separate the cheeks from the upper lip. The term derives from Latin nasus for `nose` and labium for `lip`. ==Cosmetology issues== With ageing the fold... Found on http://en.wikipedia.org/wiki/Nasolabial_fold