Wrinkles around the mouth form from a combination of repetitive muscle movement, sun damage, and the gradual loss of structural support beneath the skin. The area around your lips is uniquely vulnerable because the skin there is thinner than most of your face, and the muscle underneath has very little fat padding to cushion it from constant use. Understanding the specific causes helps explain why these lines appear when they do, and what actually makes a difference in slowing them down.
How Repetitive Movement Creates Lines
The muscle circling your lips is responsible for pulling your lip tissue inward and together. You use it every time you eat, drink, talk, whistle, or kiss. Unlike muscles in your arms or legs, this one sits right beneath a thin layer of skin with minimal fat over it. That means every contraction shows on the surface.
When you’re young, your skin snaps back after each movement because collagen and elastin keep it resilient. Over time, those proteins break down and the skin loses its ability to bounce back. Creases that once disappeared after you stopped pursing your lips begin to stick around permanently. These are sometimes called “barcode lines” because of how they look above the upper lip: a series of fine vertical grooves etched into the skin.
Any habit that involves repeated puckering accelerates the process. Smoking is the most well-known culprit, but drinking through a straw, playing wind instruments, and even frequent lip pursing all contribute. The mechanical principle is the same in each case: you’re folding the same thin skin along the same crease lines, hundreds or thousands of times, while the proteins that help it recover are steadily declining.
Sun Damage Hits This Area Hard
Ultraviolet light, particularly UVA rays, penetrates all layers of the skin down to the deepest level where collagen and elastin live. Over years of exposure, UV radiation destroys these structural proteins, a process called photoaging. The Cleveland Clinic lists lines and wrinkles around the eyes and mouth as one of the hallmark signs, specifically noting that they increase in both number and depth with cumulative sun exposure.
The skin around the mouth is especially susceptible because most people don’t apply sunscreen to their lips or the thin strip of skin between the nose and upper lip as diligently as they do the rest of their face. That unprotected zone absorbs UV damage silently for decades before the results become visible.
Bone and Fat Loss Change Your Face’s Structure
Wrinkles around the mouth aren’t just a skin problem. Beneath the skin, a deeper transformation is happening in the bones and fat pads of your face. Starting in your 30s and 40s, the fat pads that give your midface its fullness begin to thin and shift downward under gravity. This creates more prominent smile lines (nasolabial folds) and contributes to sagging around the jaw.
Then something less obvious happens: the bones of the central face and jaw actually shrink. The bones of the upper and lower jaw degrade and rotate backward and downward, reducing the scaffold that supports your skin and soft tissue. The result is that skin and muscle that once fit snugly over the bone structure now have too much surface area for the framework underneath. Folds and wrinkles deepen because the tissue is essentially draping over a smaller foundation.
This is why wrinkle treatments that only target the skin’s surface often produce limited results for deeper lines. Part of what you’re seeing isn’t damaged skin alone. It’s the collapse of the support system underneath it.
Tooth Loss Makes It Worse
Losing teeth has a surprisingly dramatic effect on the appearance of the mouth area. When teeth are missing, the jawbone in that region begins to shrink because it no longer receives the stimulation that keeps it dense. Research published in the International Journal of Oral and Maxillofacial Surgery found that even early stages of jaw shrinkage after tooth loss cause the muscles around the mouth to collapse inward, narrowing the mouth, reducing lip support, and pulling the lips inward.
In more advanced stages, the lower face loses vertical height and the chin becomes more prominent, which makes all of these soft tissue changes look even more pronounced. This is why people who have worn dentures for many years sometimes develop deep lines radiating from the mouth. The underlying bone that once held everything in place has gradually resorbed.
Hormonal Changes After Menopause
Estrogen plays a significant role in maintaining skin thickness and collagen production. After menopause, collagen declines by roughly 2.1% per year, with the most rapid losses happening in the first five years. During that window, women can lose about 30% of their skin collagen.
Skin thickness measurements confirm the effect. Research published in the Journal of the Medical Association of Thailand found that women in early postmenopause had significantly thinner skin than premenopausal women, with average thickness dropping from 2.28 mm to 2.02 mm. That may sound small, but on already-thin perioral skin, even a fraction of a millimeter translates to visibly less cushion between the muscle and the surface. This is one reason mouth wrinkles often seem to appear suddenly in a woman’s late 40s or 50s, even without major changes in sun exposure or habits.
What Actually Helps
Retinoids remain one of the most studied topical treatments for wrinkles around the mouth. In one clinical trial, participants with moderate to severe wrinkling around the eyes and lips used a tretinoin-based cream alongside light-based treatments over 90 days. Among those in the treatment group, 72% achieved at least 75% overall improvement, compared to just 19% in the control group receiving the light treatment alone. The retinoid made a substantial difference on its own.
Daily sunscreen on and around the lips slows photoaging. Lip balms with SPF help, but the strip of skin between the nose and upper lip needs regular sunscreen application too. Limiting repetitive puckering movements where practical (switching from straws to sipping directly, for example) reduces mechanical stress on the skin, though this matters most as a cumulative habit rather than an occasional choice.
For deeper lines that have already formed, dermatologists often combine approaches. Laser resurfacing removes damaged surface layers and stimulates new collagen growth. Microneedling works on a similar principle at a smaller scale. Dermal fillers restore lost volume beneath the skin, compensating for the fat and bone loss that creates structural sagging. These are typically combined with a consistent at-home routine rather than used in isolation. The lines around the mouth come from multiple causes acting together, so effective treatment usually addresses more than one layer of the problem.