Skin Care Education

Perioral Lines

Lines and wrinkles that develop in the skin surrounding the mouth, including above the upper lip, below the lower lip, and around the mouth corners. Caused by a combination of repeated muscle movement, volume loss, and structural skin ageing.

What Are Perioral Lines?

Perioral lines is the clinical term for the lines, creases, and wrinkles that develop in the skin of the perioral region, meaning the skin surrounding the mouth. Peri is a prefix meaning around, and oral refers to the mouth. The term encompasses the full zone of skin surrounding the lips, including the vertical creases above the upper lip, any wrinkles below the lower lip, and the lines and creases that develop at and around the corners of the mouth.

The perioral area is one of the most mechanically active regions of the entire face. The orbicularis oris, the circular muscle that encircles the mouth, contracts with virtually every oral movement: speaking, eating, drinking, smiling, pursing, and countless other daily activities. Over many years, the cumulative mechanical effect of these constant contractions creates and progressively deepens the creases characteristic of perioral ageing. This high level of activity, combined with the relatively thin and less sebaceous skin of the perioral region and the progressive loss of structural support in the lips and surrounding tissue, makes this area particularly prone to early and prominent line formation.

Perioral lines is the broader clinical term that encompasses all lines in the perioral region. Lip lines is a more specific colloquial term that tends to refer primarily to the vertical creases above the upper lip. In everyday use the two terms are often used interchangeably, though clinically perioral lines covers a wider area. Both describe the same fundamental ageing process in the mouth region.

Causes and Contributing Factors

Factor	Description
Orbicularis oris muscle activity	The orbicularis oris encircles the entire mouth and contracts with every oral movement. The mouth is in near-constant motion throughout the waking day, and the perioral skin is subject to more frequent mechanical deformation than almost any other area of the face. Over decades of constant movement, the overlying skin is progressively creased, particularly where the muscle contraction is most concentrated, which is typically above the upper lip.
Volume loss in the lips and perioral tissue	The lips naturally lose volume with age as the fat and structural tissue within and around them reduces. The skin surrounding the lips similarly loses its internal support as perioral soft tissue diminishes. This volume loss removes the scaffolding that was maintaining the smooth, plump surface of the perioral skin, allowing existing lines to deepen and new ones to develop.
Loss of skin elasticity	As collagen and elastin in the perioral skin decline, the skin becomes less resilient and less able to return fully to a smooth state after the repeated mechanical stress of orbicularis contractions. Dynamic perioral lines that previously resolved at rest gradually transition to static lines.
UV exposure	The skin above the upper lip receives consistent sun exposure and is particularly susceptible to UV-related structural protein breakdown. Cumulative UV damage in this area accelerates the development of perioral lines beyond what would be expected from intrinsic ageing alone.
Smoking	One of the most significant accelerators of perioral line formation. Smoking combines the repeated forceful pursing of the lips with every inhalation, substantially increasing orbicularis muscle activity, with the direct chemical damage that tobacco smoke components cause to the structural proteins of the perioral skin. This dual mechanical and chemical assault makes smoking one of the earliest and most reliable predictors of premature perioral ageing.
Lip anatomy and natural lip volume	Individuals with naturally thinner lips or less perioral soft tissue have less structural support for the skin in this region and may develop perioral lines earlier. The natural anatomy of the lip and perioral area, which is significantly genetically determined, influences the baseline vulnerability of this area to line formation.
Habitual oral movements	Specific habitual oral movements beyond normal expression, including habitual lip pursing, repeated use of straws, and certain instrumental playing, increase the frequency and intensity of orbicularis contractions and can contribute to earlier and more prominent perioral line development.

Frequently Asked Questions: Perioral Lines

Lip lines is a specific term that tends to refer to the fine vertical creases that radiate upward from the vermilion border of the upper lip into the skin above it. Perioral lines is the broader clinical term that covers all lines and wrinkles in the entire perioral region: above the upper lip, below the lower lip, and around the corners of the mouth. All lip lines are perioral lines, but not all perioral lines are lip lines. In practice, both terms are commonly used to describe the same primary concern, the vertical creases above the upper lip, and the distinction is rarely clinically significant in everyday conversation.

Several factors converge to make the perioral area particularly susceptible. The orbicularis oris is one of the most frequently contracting muscles in the entire face due to the constant oral activity required for speaking, eating, and expression. The perioral skin is relatively thin, has fewer sebaceous glands than many other facial areas, and produces less natural oil to support its barrier. It is subject to significant UV exposure. And progressive volume loss in the lips and perioral soft tissue removes the structural support that was previously maintaining the smoothness of the surface. The combination of high mechanical activity, thinner skin, and progressive structural decline creates conditions that consistently produce early and prominent line formation.

In theory, habitual use of a straw does involve repeated pursing and contraction of the orbicularis oris in a pattern similar to smoking, though with significantly less force and frequency. For most people who use straws occasionally, the contribution to perioral line development is likely to be minimal. In individuals who habitually use straws for the majority of their daily fluid intake over many years, there may be some incremental contribution to perioral line development from the repeated muscle activity. The effect is much smaller than that of smoking, and the overall significance of straw use as a contributor to perioral ageing is likely modest compared to the other factors involved.

For most non-smokers with moderate sun protection, fine dynamic perioral lines may begin to appear in the early to mid-30s, with static lines that remain visible at rest typically developing from the late 30s to 40s onward. In smokers, noticeable perioral lines can appear significantly earlier, sometimes from the mid-20s, due to the combined mechanical and chemical effects of smoking. Genetics also plays a meaningful role, with individuals who have naturally thinner lips or less perioral soft tissue sometimes developing lines earlier than average.