There's an absence of the nasolabial fold, which is the skin fold that runs from the side of the nose to the corner of the mouth.
鼻唇沟变浅或消失；鼻唇沟指鼻子两侧到嘴角的皮肤褶皱。
Nasolabial folds
原声例句
Osmosis-神经
中文百科
鼻唇沟 Nasolabial fold
（重定向自Nasolabial folds）
鼻唇沟通常也被称为法令纹，是位于鼻子和嘴两侧的皮肤褶，鼻唇沟分开了上嘴唇和脸颊。一般在笑的时候，鼻唇沟会较明显，此外，年纪大了以后也会更加明显，因此去除鼻唇沟常成为美容的一个项目。
英语百科
Nasolabial fold 鼻唇沟
（重定向自Nasolabial folds）
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. It is defined by facial structures that support the Buccal fat pad. They separate the cheeks from the upper lip. The term derives from Latin nasus for "nose" and labium for "lip".
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