Lip anatomy · Plain-language guide

Lip anatomy terms, explained.

Vermilion means the coloured part of the lip; Cupid’s bow is the central curve of its upper border; the philtrum is the groove between the nose and upper lip. Projection describes how far a lip extends forwards in profile. Use this glossary to describe a feature or understand a consultation, not to choose an ideal shape or diagnose a change.

What do the main lip anatomy terms mean?

Vermilion is the coloured lip surface. The vermilion border is its edge, Cupid’s bow is the central upper curve, philtral columns are the ridges above it, and oral commissures are the mouth corners. Orbicularis oris is the muscle around the mouth.

Lip terms at a glance
TermPlain English meaning
VermilionThe coloured surface of the lip.
Vermilion borderThe edge between the coloured lip and facial skin.
White rollThe fine, pale ridge along that edge.
Cupid’s bowThe two peaks and central dip in the upper lip outline.
Philtral columnsThe two ridges between the nose and upper lip.
Oral commissuresThe mouth corners.
Orbicularis orisThe muscle around the mouth that helps close and purse the lips.

The NIH oral-anatomy terminology explains these landmarks. The detailed answers below distinguish location, surface condition and movement.

What is the vermilion border?

The vermilion border is the edge where the coloured lip meets the surrounding skin. It is the outline you might follow with lip liner. The fine, paler ridge along that edge is sometimes called the white roll. If you say your lips look less defined, explain whether you mean this outline, the coloured surface or the skin above it. Those descriptions point to different features.

What is Cupid’s bow?

Cupid’s bow is the double curve in the centre of the upper lip border, with two peaks and a dip between them. Its shape varies: the peaks can be more rounded or more pronounced. A softer curve is not automatically a problem. If this is the feature you mean, point to the outline and explain whether you have noticed a change or are asking about your usual shape.

What is the philtrum, and what are philtral columns?

The philtrum is the central groove between the base of your nose and your upper lip. The two raised ridges beside it are the philtral columns, which lead towards the peaks of Cupid’s bow. This is part of the skin above the coloured lip. If you describe a long upper lip, clarify whether you mean this skin area or how much coloured lip is visible.

NIH: the philtrum and its bordering ridges. This definition is not a target measurement or a recommendation to change your lips.

Is there an ideal ratio between the upper and lower lip?

There is no single ratio everyone should aim for. A lip ratio often compares the visible height of the upper coloured lip with the lower one; it does not describe the whole face or how the lips move. If someone gives you a number, ask what was measured and in which view. Assessment considers your own proportions and preferences rather than using a number alone to recommend a change.

How is lip projection different from lip height?

Projection is how far your lips extend forwards when viewed from the side. Visible lip height is how much coloured lip shows vertically from the front. A lip can look narrow from the front yet project clearly in profile. If you say your lips look thin or prominent, describe the view you mean. The two descriptions are not interchangeable, and neither measurement alone decides whether treatment is appropriate.

What does dental show mean?

Dental show means how much of your teeth is visible when your lips are relaxed, during speech or when you smile. Gum show describes the visible gum above the teeth. These can change as the upper lip lifts and the mouth widens, so a still photograph shows only one moment. Mention recent dental work and any difficulty with comfortable closure, speech or eating; those concerns may need dental or medical assessment.

What is orbicularis oris?

Orbicularis oris is the muscle around the mouth that helps close and purse your lips. Other facial muscles also contribute to a smile and lip movement. For example, your lips change shape when you say words, purse them or smile. During assessment, use comfortable, ordinary movements rather than trying to make a feature look more pronounced. Tell the practitioner if a movement is difficult or uncomfortable.

Cleveland Clinic explains lip structures and the muscles involved in movement.

What are the oral commissures?

The oral commissures are the corners of your mouth, where the upper and lower lips meet. The word names a location. If you are concerned about a corner, explain whether you mean its position, a nearby crease or symptoms such as soreness or cracking. These are different questions. A sore mouth corner needs assessment of the cause, rather than an assumption that it is a cosmetic shape concern.

For a health concern, Cleveland Clinic describes the role of a dentist or primary-care clinician; cosmetic assessment does not replace that care.

Are dry lips the same as lips that have lost volume?

No. Dryness describes the surface condition; volume refers to fullness. DermNet describes eczematous cheilitis and surface symptoms; persistent soreness or cracking needs appropriate medical assessment before assuming a cosmetic volume concern.

How are these terms used at my consultation?

Corey explains the words while examining the features you want to discuss, at rest and during speech and smiling. You do not need to memorise anatomy: point to the area or ask him to show you what a term means. One initial general consultation is complimentary per person. Check the selected Square appointment listing for its current duration, availability and any fee before booking.

Consultation comes first. If treatment is suitable and appropriate on the day, it can be discussed after assessment, explanation of risks, informed consent, agreement on itemised costs and any required clinical arrangements. Booking does not guarantee treatment. If another day is needed, Corey explains why and the next step. You can leave with information only.

Ahpra explains assessment and informed-consent responsibilities. Appointment fees and arrangements above are clinic policies, not anatomy findings.

Want to discuss your own concern?

You do not need to know the anatomy words before booking. Describe what you have noticed, or use the lip consultation page to understand the appointment first.

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