White line of the lip: contour and definition
- Nerve
Quick facts
- Location
- Border between the lip skin and the vermilion, on the upper and lower lips.
- Appearance
- Thin, pale, slightly raised band that reflects light and outlines the mouth.
- Anatomical basis
- Eversion of the marginal portion of the orbicularis oris muscle under the skin of the border.
- Relevance in orofacial harmonization (HOF)
- Defines the lip contour; loses sharpness with age and guides contour treatment.
- In Harmy
- Part of the area of the Lips point.
The white line of the lip is the thin, pale, slightly raised band that separates the lip skin from the vermilion. In the literature it is called the "white roll". It reflects light and works as the natural outline of the mouth: it is what makes the lip's shape look crisp, with defined edges, instead of blurred.
Where is it and what forms the white line?
It follows the entire border of the vermilion, on the upper and lower lips. On the upper lip, it rises and falls with the Cupid's bow and marks the peaks that meet the columns of the philtrum.
The elevation comes from the marginal portion of the orbicularis oris muscle, which curves outward under the skin of the border. The skin there is paler and hairless, and the relief forms a small ridge that catches the light. The line is most visible under frontal light and in younger people.
| Structure | Where it is | What it defines |
|---|---|---|
| White line | Border between skin and vermilion | Sharpness of the contour |
| Dry vermilion | Red part visible with the mouth closed | Color and apparent volume |
| Wet line | Transition between dry vermilion and mucosa | Inner limit of the lip |
| Cupid's bow | Center of the upper lip | Shape of the peaks |
How does the white line change with age?
Over time, the upper lip tends to lengthen and lose volume, the vermilion thins, and the eversion of the border decreases. The white line becomes less raised and less sharp, the Cupid's bow fades, and vertical lines appear in the skin above the lip (lip lines). A practical sign patients mention is lipstick that "bleeds" into the skin lines.
Why does it matter in orofacial harmonization (HOF)?
In lip filler, some patients ask for more definition, not necessarily more volume. Contour treatment aims to restore the sharpness of the border with small volumes, respecting each person's original shape.
The most cited risks in border treatment are a step or "shelf" above the lip, product buildup and migration into the skin above the border, palpable irregularities, and an artificial look with loss of the Cupid's bow. The superior labial artery runs through the lip and, with hyaluronic acid, hyaluronidase must be available. Technique, plan, and product are decisions for the qualified professional, in line with the rules of their professional council in Brazil.
How does it show up in the assessment?
- Compare the sharpness of the border on both sides and between the upper and lower lip.
- Observe the Cupid's bow and the continuity of the line at the peaks.
- Note perioral lines and whether lipstick migrates into them.
- Ask whether the patient wants volume, definition, or both: the answer changes the plan.
Also called: white roll, lip border, vermilion border, lip contour.
Frequently asked questions
What is the white roll on the lip?
It is the name of the white line of the lip: the thin, pale, slightly raised band that separates the skin from the vermilion and outlines the mouth.
Can filling the lip contour make the lip look artificial?
It can, when the volume is excessive or the product builds up above the border, creating a step. For this reason the contour is usually treated with conservative volumes and reassessment, at the professional's discretion.