Dark under-eye circles typically come from one of three things: excess pigment in the skin, blood vessels showing through thin skin, or shadows cast by the natural contours of your face. Most people have a combination of all three, which is why dark circles can be so stubborn. Understanding which type you’re dealing with is the first step toward actually improving them.
The Three Types of Dark Circles
Dermatologists classify dark circles into three categories based on what’s causing the discoloration, and each one looks different. Pigmented dark circles appear brown and are caused by extra melanin concentrated in the under-eye skin. Vascular dark circles look blue, purple, or pink and come from blood vessels visible beneath skin that’s unusually thin. Structural dark circles are actually shadows created by hollows, puffiness, or the shape of your facial bones rather than any color change in the skin itself.
You can figure out which type you have with a simple test. Gently stretch the skin under your eye with one finger. If the darkness fades or disappears, you likely have the vascular type, where blood vessels are showing through thin skin and stretching temporarily flattens them. If the color stays exactly the same regardless of stretching or pressing, you’re dealing with pigment-based dark circles. And if the darkness shifts or changes depending on the angle of light hitting your face, shadows from your facial structure are the main culprit.
Most people have a mix. You might have some excess pigment combined with thin skin that lets vessels show through, plus a slight hollow that casts a shadow. This is why a single eye cream rarely solves the problem completely.
Why Genetics Play Such a Large Role
If your parents or siblings have noticeable dark circles, there’s a strong chance yours are inherited. In one study of 200 patients with dark circles, 63% had a positive family history. Among those whose dark circles were classified as “constitutional,” meaning they weren’t caused by any medical condition or lifestyle factor, 77% had family members with the same issue. Researchers have described this as an autosomal dominant trait, which means you only need to inherit the tendency from one parent for it to show up.
Certain ethnic backgrounds carry higher rates of under-eye darkening. People of South Asian, Southeast Asian, and Middle Eastern descent tend to have more melanin-producing cells in the deeper layers of under-eye skin, a condition called dermal melanocytosis. In one study comparing ethnic groups, 94% of Indian patients and 65% of Malay patients had the constitutional pigment type. This deeper pigment is particularly resistant to topical treatments because it sits in the dermis rather than on the skin’s surface.
What’s Happening Under Your Skin
The skin beneath your eyes is the thinnest on your entire body. With less tissue between the surface and the underlying muscle and blood vessels, anything happening below becomes visible. The purplish color you see is essentially the orbicularis oculi muscle (the circular muscle you use to blink) and its blood supply showing through a nearly translucent layer of skin. This effect is strongest on the inner corner of the lower eyelid, where the skin is thinnest.
As you age, this gets worse for several reasons. Collagen in the under-eye area breaks down, making already-thin skin even thinner and more transparent. Subcutaneous fat beneath the skin decreases, removing the cushion that once helped mask the underlying color. At the same time, the bones of your eye socket gradually recede and lose volume, creating a deeper hollow. The ligaments that attach skin to bone become relatively tighter as fat descends, producing the tear trough, that curved depression running from the inner corner of your eye toward your cheek. Overhead lighting hits this hollow and casts a shadow that makes the area look darker than it actually is.
Lifestyle Factors That Make It Worse
Sleep deprivation doesn’t cause dark circles on its own, but it makes existing ones more prominent. When you’re tired, your skin becomes paler, which increases the contrast between your under-eye area and the rest of your face. Blood vessels also dilate with fatigue, making vascular-type circles more visible. Fluid retention from sleeping flat or eating high-sodium foods can cause puffiness, which creates additional shadows.
Sun exposure drives melanin production in the under-eye area, worsening pigmented dark circles over time. UV damage also accelerates collagen breakdown in the delicate periorbital skin. Rubbing your eyes repeatedly, whether from habit, allergies, or contact lens use, causes friction-related pigmentation called post-inflammatory hyperpigmentation. The skin responds to chronic irritation by depositing more melanin as a protective response.
Allergies deserve special mention. Chronic nasal congestion from allergies causes venous stasis, where blood pools in the small veins that drain the area around your eyes. This pooling creates the classic “allergic shiners,” dark, puffy circles that worsen during allergy season or whenever congestion flares. Managing the underlying allergies often visibly reduces this type of darkness.
Topical Ingredients That Help
Different types of dark circles respond to different ingredients, which is why the same eye cream works brilliantly for one person and does nothing for another.
For pigment-based circles, vitamin C and tranexamic acid are the most studied options. In a clinical trial comparing the two (both delivered via microneedling for better penetration), tranexamic acid performed slightly better: 57% of patients in the tranexamic acid group achieved good or excellent improvement after 12 weeks. Tranexamic acid works by blocking the chemical signals that trigger melanin production and also reduces redness by calming excess blood vessel activity, making it useful for both pigmented and vascular types.
For vascular circles, caffeine and vitamin K target the blood vessel component. Caffeine constricts blood vessels and reduces fluid retention. Vitamin K helps with the breakdown of leaked blood pigments beneath the skin. In one four-week study using a pad containing 3% caffeine and 1% vitamin K, 100% of participants showed improvement in under-eye darkness, with an average 16% reduction in visible discoloration. That’s modest but visible, especially with consistent use.
Retinol helps with both types over time by stimulating collagen production and thickening the dermal layer, which makes blood vessels less visible. It also speeds cell turnover, which can gradually reduce superficial pigment. Start with a low concentration under the eyes, since the thin skin there is more prone to irritation.
Sunscreen is non-negotiable for pigmented dark circles. Without daily UV protection, any progress you make with other treatments will be undone by ongoing sun-stimulated melanin production.
Professional Treatment Options
When the cause is structural, topical treatments have limited impact because the problem isn’t color, it’s contour. Hyaluronic acid filler injected into the tear trough can fill the hollow and eliminate the shadow effect. Results are immediate and typically last 6 to 12 months. However, this area is technically demanding. If filler is placed too superficially, it can create a bluish discoloration called the Tyndall effect, where the gel scatters blue light through the skin and actually makes the area look worse. This is more common with inexperienced injectors and in people with very thin skin.
Chemical peels and laser treatments can address pigment-type circles by breaking up melanin deposits, though deeper dermal pigment (common in darker skin tones) is harder to reach and may require multiple sessions. Platelet-rich plasma injections have shown promise in clinical studies, with ultrasound measurements showing an average 35% increase in dermal thickness and significant reductions in collagen damage markers after treatment. Thicker skin means less show-through of underlying vessels.
For allergic shiners, treating the nasal congestion with antihistamines or nasal corticosteroids often produces noticeable improvement in under-eye color without any cosmetic intervention at all.
Why Your Dark Circles Look Worse Some Days
If you’ve noticed your dark circles fluctuate, you’re not imagining it. Vascular-type circles are especially variable. They worsen during menstruation due to hormonal changes that dilate blood vessels. They look worse after alcohol consumption, poor sleep, or crying, all of which cause fluid shifts and vessel dilation around the eyes. Dehydration makes skin appear thinner and less plump, increasing contrast. Even the angle of light in your bathroom can dramatically change how dark your circles appear: overhead lighting deepens shadows in the tear trough, while direct, front-facing light minimizes them.
Pigmented circles, by contrast, are more consistent day to day but worsen gradually with cumulative sun exposure and aging. Structural shadows deepen slowly over years as fat pads shift and bone resorbs. If your circles seem to have gotten dramatically worse in a short period, consider whether a new allergy, medication, or sleep disruption could be driving the change before assuming it’s permanent.