Black or dark circles under the eyes usually come from one of four causes: visible blood vessels beneath thin skin, excess pigment in the skin itself, shadows cast by changes in facial structure, or some combination of all three. They’re rarely a sign of anything dangerous, but understanding which type you have makes a big difference in whether anything actually helps.
Why the Under-Eye Area Is So Vulnerable
The skin beneath your eyes is thinner than almost anywhere else on your body. It has less fat cushioning it, fewer oil glands to keep it plump, and a dense network of tiny blood vessels sitting just below the surface. That combination means anything happening underneath, whether it’s pooling blood, melanin buildup, or bone and fat shifting with age, shows through more easily here than it would on your cheek or forehead.
The Four Types of Dark Circles
Dermatologists generally classify dark under-eye circles into four categories: pigmented, vascular, structural, and mixed. Most people have a mix, but one type usually dominates.
Pigmented
This type comes from excess melanin deposited in the skin itself. It can sit in the outer layer of skin (the epidermis) or deeper in the dermis, and the depth matters. Deeper pigment looks more grey-blue and is harder to treat, while surface-level pigment appears brown and responds faster to topical products. People with darker skin tones are more prone to this type because their skin naturally produces more melanin, and the under-eye area is especially reactive to sun exposure, friction from rubbing your eyes, or inflammation from conditions like eczema.
Vascular
When the blood vessels beneath your eyes dilate or blood pools in the area, the skin takes on a purple, blue, or reddish tint. This is especially common in people with fair skin, where even normal blood flow can show through. Poor sleep, dehydration, and excess salt can all worsen this type by increasing fluid retention and slowing circulation. Allergies are another major trigger. Nasal congestion from hay fever causes swelling in the lining of your nose, which slows blood flow through the veins near your sinuses. Those veins sit right beneath the under-eye skin, so when they swell, the area looks darker and puffier. Doctors sometimes call this specific pattern “allergic shiners.”
Structural
This type has nothing to do with skin color at all. Instead, the shape of your face creates shadows that make the under-eye area look dark. A deep groove between your lower eyelid and cheek (called the tear trough) is the most common culprit. Some people are born with a naturally deep tear trough due to the shape of their cheekbone, while others develop it over time as the fat pads around the eye shrink and the ligaments holding everything in place stretch and weaken.
Aging accelerates this significantly. The fat beneath the eye can shift forward, creating visible puffiness or “bags,” while the cheekbone gradually loses volume. The result is a deeper hollow that catches light in a way that looks like a dark circle, even when the skin itself is perfectly normal in color.
Mixed
Most people have some combination of the above. You might have both thin, translucent skin that shows blood vessels and a deepening tear trough that casts shadows. This is the most common presentation, and it’s one reason why a single product or treatment rarely eliminates dark circles completely.
A Simple Way to Tell Which Type You Have
There’s a quick self-test you can do at home. Gently pinch and lift the skin of your lower eyelid. If the dark color lifts with the skin, pigmentation is likely the main cause. If the color disappears when you stretch the skin, it’s more likely blood pooling beneath thin skin or shadows created by the underlying bone structure. This isn’t a clinical diagnosis, but it gives you a useful starting point for choosing the right approach.
Common Triggers That Make Them Worse
Several everyday factors can deepen dark circles regardless of your underlying type:
- Sleep deprivation causes blood vessels to dilate and fluid to accumulate, making both vascular and structural circles more obvious.
- Allergies trigger nasal congestion that backs up blood flow into the veins beneath the eyes. Rubbing itchy eyes also deposits pigment over time from repeated friction.
- Sun exposure stimulates melanin production, particularly in the thin under-eye skin, worsening pigmented circles.
- Dehydration and high sodium intake increase water retention in the under-eye tissue, which amplifies puffiness and shadow.
- Genetics play a large role. If your parents had prominent dark circles, you likely inherited thinner skin, deeper-set bone structure, or a tendency toward excess pigmentation in the area.
- Aging reduces collagen, thins the skin further, and causes fat and bone loss that deepens the tear trough.
Topical Treatments and What the Evidence Shows
Eye creams are the first thing most people reach for, but the results depend heavily on which type of dark circle you’re dealing with. For pigmented circles, ingredients that reduce melanin production (like vitamin C, niacinamide, and retinol) have the strongest track record. One study found that a combination of 1% vitamin K and 0.15% retinol improved under-eye circles in 93% of patients, though the improvement was in appearance rather than complete elimination.
Caffeine is a common ingredient in eye creams because it temporarily constricts blood vessels, which can reduce the blue-purple tint of vascular circles. A clinical trial using eye pads with 3% caffeine and 1% vitamin K found a 16% reduction in dark circle appearance from baseline. That’s modest but visible, and it aligns with what most people experience: a subtle improvement, not a dramatic transformation.
For structural circles caused by volume loss and shadows, topical products do very little. No cream can replace lost fat or lift a sunken tear trough.
What Works for Structural Changes
When the problem is a deep groove or visible fat pads creating shadows, the most common in-office approach is injectable filler placed along the tear trough. This fills the hollow and reduces the shadow effect. However, the under-eye area is one of the trickiest spots for filler. If too much product is placed too close to the surface, it can create a blue-grey tint called the Tyndall effect, where light scatters through the filler material and actually makes the discoloration look worse. Some experts believe this happens because the filler pushes veins closer to the skin surface rather than from light scattering alone. Either way, it’s a well-known risk in this area.
For pigmented circles where melanin sits deep in the dermis, certain laser treatments can target both pigment and excess blood vessels. Deeper melanin deposits respond more slowly than surface pigment, and multiple sessions are typically needed.
Why They Often Get Worse With Age
The under-eye area changes on multiple levels simultaneously as you get older. The skin loses collagen and becomes more translucent, making blood vessels more visible. The fat pads that once provided a smooth cushion either shrink or shift forward, creating both hollows and puffiness. The ligaments connecting your skin to the bone around the eye socket stretch and weaken, allowing tissue to sag. The cheekbone itself gradually loses volume, pulling the midface support structure downward and deepening the tear trough.
These changes compound each other. A person who had mild vascular circles in their twenties might develop noticeable structural shadows by their forties, not because anything went wrong, but because the anatomy of the area naturally shifts over decades. This layering effect is why dark circles tend to get more stubborn over time, and why the most effective strategies often combine approaches: a retinol product for pigment, good allergy management if congestion is a factor, and possibly an in-office procedure if volume loss is significant.