Those lines under your eyes at 14 are almost certainly not wrinkles in the aging sense. Your body doesn’t start losing collagen in any meaningful way until well into adulthood, so what you’re seeing has a different explanation. The skin under your eyes is the thinnest on your entire face, measuring less than a millimeter thick, which makes every crease, shadow, and texture change far more visible there than anywhere else.
Several common causes explain these lines, and most of them are easy to address or simply part of how your face naturally moves.
Expression Lines vs. Actual Wrinkles
When you smile, squint, or laugh, the skin beneath your eyes folds into small creases. These are expression lines, not wrinkles. They appear because your skin is doing exactly what it’s designed to do: stretch and move with your facial muscles. Once you relax your face, those lines should flatten out or nearly disappear. As one University of Utah dermatologist puts it, teenagers don’t have wrinkles. You might see lines when you smile, but those are natural facial expressions that vanish once you stop smiling.
If you’re noticing them more now, it might simply be that you’re looking more closely in the mirror than you used to. That’s completely normal at your age, but it can make you hyper-aware of textures that have always been there.
Why Under-Eye Skin Shows Everything
The lower eyelid measures roughly 0.8 millimeters thick on average. For comparison, the skin on the tip of your nose is more than twice that. This extreme thinness means blood vessels, fluid shifts, and even slight dryness show up immediately under your eyes in ways they wouldn’t on your cheeks or forehead. Fine, crinkly texture in this area is common at every age and doesn’t signal aging.
Dehydration and Dry Skin
One of the most common reasons teens notice lines under their eyes is simple dryness. When the skin lacks moisture, it loses its plumpness temporarily and fine lines become more obvious. This can happen from not drinking enough water, spending time in dry or air-conditioned rooms, washing your face with harsh cleansers, or cold winter air pulling moisture from your skin.
A basic fragrance-free moisturizer can make a noticeable difference. Look for products containing hyaluronic acid or ceramides. Hyaluronic acid is a humectant, meaning it pulls water into the skin and holds it there, binding many times its own weight in moisture. Ceramides help repair and strengthen the skin’s natural barrier so moisture doesn’t escape as quickly. Either ingredient is gentle enough for teenage skin.
Sleep, Allergies, and Eye Rubbing
Poor sleep is one of the leading causes of puffiness and texture changes around the eyes. When you don’t sleep enough, fluid can pool in the tissue under your eyes, stretching the skin slightly. Over time, repeated swelling and deflating can make fine lines more visible. Teenagers need 8 to 10 hours of sleep per night, and many get significantly less, especially during the school year.
Allergies are another major factor. If you deal with seasonal allergies, dust allergies, or pet allergies, the immune response causes swelling in the lining of your nasal passages. That swelling slows blood flow through the small veins sitting just beneath your under-eye skin, creating dark circles and puffiness. The itchiness that comes with allergies makes things worse because rubbing your eyes irritates the delicate skin, creating more visible creasing and texture changes over time. These allergy-related shadows and lines are sometimes called “allergic shiners.”
There’s also a related feature called Dennie-Morgan folds: extra creases that run horizontally beneath the lower eyelid. These are strongly associated with eczema (atopic dermatitis) and often appear in childhood. If you have eczema, asthma, or food allergies alongside these under-eye lines, the folds may be connected to that underlying condition rather than anything you’re doing wrong.
Sun Exposure Already Matters
While your collagen production is still at its peak, sun damage is one thing that genuinely can cause early skin changes in teenagers. Research on children in high-UV environments like Australia has found detectable signs of sun-related skin damage, including premature mild wrinkling, in kids as young as their early teens. Ultraviolet light breaks down the elastic fibers in your skin that keep it bouncy and smooth.
This doesn’t mean you need an elaborate skincare routine. Wearing sunscreen daily is the single most effective thing you can do for your skin right now, both to address any existing sun-related texture changes and to prevent future ones. A broad-spectrum SPF 30 or higher, applied to your face including the under-eye area, is enough.
What You Don’t Need
Social media makes it easy to believe you should be using retinol serums, glycolic acid toners, and other anti-aging products. Dermatologists specifically advise against this for teenagers. Retinoids cause redness, peeling, and drying on young skin and aren’t necessary when your skin is still producing collagen at full speed. Glycolic acid can cause burning, rashes, and swelling. Even botanical-scented products like rosewater sprays and lavender lotions can irritate sensitive skin and cause painful reactions, despite their natural-sounding ingredients.
Your skin at 14 needs three things: a gentle cleanser, a basic moisturizer, and sunscreen. That’s genuinely it. The lines you’re seeing are almost certainly expression lines, dryness, allergies, or the natural thinness of your under-eye skin, not signs of aging. Collagen loss significant enough to cause real wrinkles doesn’t begin for decades. The researchers who study this compare skin from people in their 20s (still at full collagen production) with skin from people over 80 to even detect a measurable difference.