The nasolabial folds, commonly known as "smile lines" or "laugh lines," are facial features. They are the two skin fold

Skin fold

Skin folds are areas of skin where it folds. Many skin folds are distinct, heritable anatomical features, and may be used for identification of animal species, while others are non-specific and may be produced either by individual development of an organism or by arbitrary application of force to...

s that run from each side of the nose to the corners of the mouth. They separate the cheek

Cheek

Cheeks constitute the area of the face below the eyes and between the nose and the left or right ear. They may also be referred to as jowls. "Buccal" means relating to the cheek. In humans, the region is innervated by the buccal nerve...

s from the upper lip

Upper lip

The upper lip covers the anterior surface of the body of the maxilla.Its upper half is of usual skin color and has a depression at its centre, directly under the nasal septum, called the philtrum, while its lower half is a markedly different, red-colored skin tone more similar to the colour of the...

. the term derives from Latin nasus for "nose" and labium for "lip

Lip

Lips are a visible body part at the mouth of humans and many animals. Lips are soft, movable, and serve as the opening for food intake and in the articulation of sound and speech...

".

Cosmetology issues

With ageing

Ageing

Ageing or aging is the accumulation of changes in a person over time. Ageing in humans refers to a multidimensional process of physical, psychological, and social change. Some dimensions of ageing grow and expand over time, while others decline...

 the fold may become more pronounced and may be become cosmetically undesirable to some. Others may consider it a sign of maturity, age, or character. The most significant factors that contribute to the prominence of the fold are excess skin, skin thinning, excess cheek fat, and ptosis

Ptosis

Ptosis refers to droopiness of a body part. Specifically, it can refer to:* Ptosis * Ptosis * Enteroptosis * Gastroptosis...

 of cheek fat.

Most common cosmetic treatments are anatomical removal, liposuction

Liposuction

Liposuction, also known as lipoplasty , liposculpture suction lipectomy or simply lipo is a cosmetic surgery operation that removes fat from many different sites on the human body...

, facelift

Facelift

Facelift is the common name for rhytidectomy, a cosmetic surgery procedure.Facelift may also refer to:* Facelift , the revival of a product through cosmetic means such as changing its appearance...

, or dermal filler injections.