Dark circles under your eyes usually mean one of three things: visible blood vessels showing through thin skin, excess pigment in the under-eye area, or shadows cast by the natural contours of your face. They’re rarely a sign of serious illness. Most of the time, they reflect some combination of genetics, aging, allergies, or lifestyle factors like poor sleep.
What makes the under-eye area so prone to discoloration is simple anatomy. The skin beneath your eyes is the thinnest on your entire body, and the network of veins underneath it is unusually complex and close to the surface. When those veins dilate, or when the skin thins further with age, the dark tones underneath become visible. Think of it like seeing a bruise more easily on thinner skin.
The Four Types of Dark Circles
Not all dark circles look the same, and the color can tell you a lot about what’s causing them.
Pigmented dark circles appear brown and result from extra melanin deposited in the under-eye skin. This type is especially common in people with deeper skin tones and tends to run in families. A study in the Indian Journal of Dermatology found that roughly 77% of people with this type had a family history of it, suggesting strong genetic transmission.
Vascular dark circles look blue, pink, or purple. These come from dilated or congested blood vessels showing through the thin periorbital skin. They often get worse with fatigue, because sleep deprivation causes blood vessels to dilate and fluid to pool. Puffiness frequently accompanies this type.
Structural dark circles are actually shadows. They’re the same color as the rest of your skin, but hollows beneath the eye (called tear troughs), puffy fat pads, or sagging skin create shadows that look dark. This type is the hardest to treat with creams because the discoloration isn’t in the skin itself.
Mixed dark circles combine two or all three of these mechanisms, and they’re the most common presentation. You might have both pigmentation and visible blood vessels, or vascular congestion made worse by a deepening tear trough.
Genetics and Skin Tone
Your genes are the single biggest predictor of whether you’ll develop dark circles. The tendency to deposit more melanin around the eyes appears to be an autosomal dominant trait, meaning you only need to inherit it from one parent. Research on different ethnic populations found that constitutional (genetic) dark circles appeared in 94% of Indian participants and 65% of Malay participants studied, highlighting how strongly skin tone and heritage influence the condition.
Even the vascular type has a hereditary component. About 63% of people with vascular dark circles in the same study had a family history of them, likely because thin periorbital skin is itself an inherited trait. If your parents had dark circles, there’s a good chance yours started appearing in your teens or twenties regardless of how well you sleep.
How Aging Deepens Dark Circles
Even if you didn’t have noticeable dark circles in your twenties, they tend to appear or worsen with age. Several things happen simultaneously. The fat pads that sit beneath your eyes start to shift forward and downward, creating visible bulges. At the same time, the bone and fat that support your mid-cheek area gradually shrink, causing the cheek to descend and exposing the groove between your lower eyelid and cheek.
This groove, the tear trough, deepens as the tissues over it thin out. The shadow it casts is commonly perceived as a dark circle that’s difficult to cover with makeup. Collagen loss also makes the skin itself more translucent, allowing the underlying blood vessels and muscle to show through more prominently. The result is a tired appearance that has less to do with how rested you are and more to do with structural changes in the face.
Allergies and Nasal Congestion
If your dark circles are seasonal or come with a stuffy nose, allergies are a likely culprit. The mechanism is straightforward: when your immune system reacts to an allergen, the lining inside your nose swells. That swelling slows blood flow in the veins around your sinuses. Because those veins sit close to the surface beneath your eyes, the area looks darker and puffy when they become engorged. Doctors sometimes call these “allergic shiners.”
This type of dark circle tends to fluctuate. It’s worse during allergy season or when you’re exposed to indoor triggers like dust mites or pet dander. Managing the underlying nasal congestion, whether through antihistamines or avoiding triggers, typically reduces the discoloration.
Sleep, Dehydration, and Other Triggers
Sleep deprivation doesn’t cause dark circles on its own, but it makes existing ones more visible. When you’re underslept, your blood vessels dilate, increasing the blue-purple tint beneath thin under-eye skin. Your body also retains more fluid, which can cause puffiness that casts additional shadows. Most people need just one or two nights of poor sleep to notice the difference.
Dehydration has a similar effect. When your body is low on fluids, the skin around your eyes can look sunken, making the hollows more pronounced. Excessive alcohol and high-sodium meals contribute to fluid retention and puffiness, worsening the shadow effect the next morning. Sun exposure accelerates pigmentation in the under-eye area, particularly in people already prone to the pigmented type. Screen time itself doesn’t cause dark circles, but the eye strain associated with long screen sessions can increase blood flow to the area and make vascular dark circles more noticeable.
What a Dermatologist Looks For
If you’re bothered enough to see a dermatologist, they’ll typically start with two simple tests. The eyelid stretch test involves gently pulling the lower eyelid skin taut. If the dark color disappears, it’s likely vascular (blood vessels) or structural (shadows). If the brown color persists, pigmentation is the primary cause. Dermoscopy, which uses a magnified light, helps confirm the type and track changes over time.
This distinction matters because treatment depends entirely on the type. A pigment-reducing cream won’t help a shadow caused by volume loss, and a filler won’t lighten melanin deposits.
Treatments That Work
For pigmented dark circles, topical treatments containing ingredients that suppress melanin production offer modest improvement. Products with vitamin K combined with retinal (a form of vitamin A) have shown roughly a 19% reduction in dark circle appearance over eight weeks in clinical testing, though results vary. Consistent sunscreen use is essential because UV exposure drives melanin production in the area.
Laser treatments have stronger evidence behind them for pigmented dark circles. A systematic review found that about 81% of patients achieved good to excellent results from laser therapy, with the best outcomes appearing after four to six months of treatment. Long-term satisfaction was high, with over 76% of patients reporting they were pleased with the reduction. Results aren’t permanent, though, and maintenance sessions are often needed.
For structural dark circles caused by tear trough hollowing, injectable fillers can restore lost volume and eliminate the shadow effect. Results typically last six months to a year. This is one of the more effective options for age-related dark circles, but the under-eye area is delicate, and the lymphatic drainage system there is fragile, so choosing an experienced injector matters.
For vascular dark circles, improving sleep, managing allergies, and reducing salt intake can make a noticeable difference. Topical caffeine has a temporary constricting effect on blood vessels and can reduce puffiness in the short term, though it won’t produce lasting change on its own. Cold compresses work on the same principle, narrowing dilated vessels for a few hours.
When Dark Circles Signal Something Else
In rare cases, dark circles can point to an underlying condition. Iron-deficiency anemia reduces oxygen in the blood, making the veins under your eyes appear darker. Thyroid disorders, particularly an underactive thyroid, can cause puffiness and discoloration around the eyes. Eczema or contact dermatitis on the eyelids can lead to post-inflammatory pigmentation that lingers long after the rash clears.
The key distinction is whether your dark circles appeared suddenly or have been present for years. Lifelong dark circles that match a family pattern are almost always constitutional. Dark circles that develop rapidly, worsen on one side, or come with other symptoms like fatigue, weight changes, or swelling elsewhere on the body are worth investigating with a healthcare provider.