Nasolabial fold
Skin folds running from the nose to the mouth corners.
These facial features are skin creases extending from the sides of the nose to the mouth corners. They separate the cheeks from the upper lip and are supported by underlying structures holding the buccal fat pad.
- Folds run from nose sides to mouth corners.
- Separates cheeks from upper lip.
- Supports buccal fat pad structures.
- Name derives from Latin for nose and lip.
- May deepen with age due to volume loss.
What it is
The nasolabial fold is a distinct facial feature consisting of two skin creases. These folds begin at the outer edges of the nose and extend downward to meet the corners of the mouth. This anatomical structure serves as a boundary between the cheek area and the upper lip. The appearance of these folds is determined by the underlying facial structures that provide support to the buccal fat pad. While commonly referred to as smile lines or laugh lines due to their association with facial expressions, they are permanent structural elements of the human face.
History and origin
The terminology originates from Latin roots. The word 'nasus' translates to nose, while 'labium' refers to the lip. This etymology directly describes the location of the feature. Some sources also suggest alternative medical terms such as melolabial fold or lip-cheek fold. Another technical designation used in anatomical contexts is the nasolabial sulcus. These variations highlight different aspects of the feature's position and form.
What it means
In everyday language, these folds are frequently called smile lines or laugh lines. This naming convention links the physical feature to emotional expressions. However, they are simply natural anatomical structures present on all faces. Their visibility can change over time. As people age, these folds may become deeper or longer. This change is often associated with the loss of fats and collagen in the skin. Cosmetic procedures like dermal fillings are sometimes used to restore volume in this area.
The science
Anatomically, these folds are defined by the support structures beneath the skin. These structures hold the buccal fat pad in place. The interaction between the skin surface and the underlying fat pad creates the visible crease. The separation of the cheek from the upper lip is a key functional aspect of this anatomy. Related structures include the nasalis muscle, which influences the surrounding area. Understanding the support system helps explain how the fold forms and maintains its shape.
Styling and care
No specific styling is required for this natural feature. It is an inherent part of facial anatomy. In cosmetology, attention is sometimes given to this area during anti-ageing treatments. Dermal fillers may be applied to replace lost volume. This approach aims to smooth the appearance of the fold. However, the feature itself requires no grooming or maintenance. It remains a constant element of facial structure regardless of personal style choices.
In culture
The common names smile lines and laugh lines reflect cultural associations with expression. These terms connect the physical trait to positive social interactions. Despite these linguistic links, the feature is universal across all populations. It does not indicate character or intelligence. The anatomy is consistent among humans worldwide. References to related features like epicanthal folds or marionette lines appear in broader discussions of facial structure. The focus remains on understanding the biological basis rather than aesthetic judgment.
Questions people ask about Nasolabial fold
What are nasolabial folds?
They are two skin folds extending from the nose to the mouth corners. They separate the cheeks from the upper lip and are supported by underlying facial structures.
Why are they called smile lines?
The term reflects their association with facial expressions. However, they are permanent anatomical features present on all faces, not just when smiling.
Do they change with age?
Yes, they may grow longer and deeper over time. This is often due to the loss of fats and collagen in the facial area.
Are there other names for them?
Other terms include melolabial fold, lip-cheek fold, and nasolabial sulcus. These are used in medical or anatomical contexts.
Good reading and sources
- Nasolabial fold on WikipediaEncyclopedia
- More photos on Wikimedia CommonsPhotos
- Wikidata recordOpen data
The facts on this page come from the Wikipedia article "Nasolabial fold", written by its contributors and used under the CC BY-SA 4.0 licence, and from its Wikidata record (CC0). EveryFaceShape rewrote the text in its own words, with AI assistance, and compares every page with the article to make sure no passage is copied. It may be reused under the same CC BY-SA 4.0 licence with a link back.
It may contain mistakes, and figures change over time. Nothing here is investment or buying advice. If something is wrong, tell us. Last refreshed 2026-11-15.
