Lip Asymmetry - Or something Else?

Lip Asymmetry—or Is It Something Else?

People often come into clinic believing one side of their lip is smaller, flatter or less defined than the other. The immediate assumption is usually that the underlying anatomy is uneven and that adding volume will correct it.

But not every apparent asymmetry is an anatomical asymmetry.

In this case, the shape and tissue of the lip are present. What creates the uneven appearance is a localised loss of pigment along the vermilion border—the natural transition between the pink lip and the surrounding skin.

Where the pigment fades or dips inward, the visible lip line appears to stop short. To the eye, that side can look thinner or less projected, even though the anatomical contour is still there. The asymmetry is being created by colour and border definition, not by a lack of lip tissue.

Why identifying the cause matters

Lip asymmetry can come from several different sources: natural anatomy, dental or skeletal structure, muscle movement, previous treatment, ageing, scarring, volume loss or differences in pigmentation. Lips can also look different at rest and during speech or smiling, which is why proper assessment is more useful than judging a single photograph.

The correction needs to match the cause.

If the perceived deficit is actually pigment loss, adding volume does not restore the missing colour or recreate the visible vermilion border. In some cases, adding volume to anatomy that is already present may make the imbalance more noticeable rather than less.

What may help when pigment is the issue?

When the anatomy is balanced but the border has lost colour, options may include:

● Carefully overlining the faded section with lip pencil

● Cosmetic lip tattooing or micropigmentation to restore visual continuity

● Leaving the anatomy untreated when additional volume is not required

Micropigmentation has been described in the dermatology literature as a method of camouflaging stable areas of lip depigmentation. The important point is not that every pale area needs tattooing, but that a pigment concern requires a pigment-based solution—not automatically a volume-based one.

This is a good example of why we need to assess what is actually creating an asymmetry before trying to correct it. Sometimes the lip is not missing at all. The anatomy is there; it is simply the loss of pigment that changes where the eye perceives the lip border to be.

Clinical references

1. Mathis A, Laskin DM, Tüfekçi E, Caricco C, Lindauer SJ. Upper lip asymmetry during smiling: an analysis using three-dimensional images. Turkish Journal of Orthodontics. 2018;31(2):32–36. Full text

2. Singh AK, Karki D. Micropigmentation: tattooing for the treatment of lip vitiligo. Journal of Plastic, Reconstructive & Aesthetic Surgery. 2010;63(6):988–991. PubMed

3. Francis A, Criton S, Shojan A, Philip R. Micropigmentation in vitiligo of lateral lower lip. Journal of Cutaneous and Aesthetic Surgery. 2013;6(4):236–237. Full text