Dark circles get worse for a combination of reasons, and the cause isn’t always the same from person to person. The skin under your eyes is some of the thinnest on your body, which means changes in blood flow, pigmentation, fat volume, and hydration all show up there first. Understanding which type of dark circle you’re dealing with is the key to figuring out why yours are deepening.
The Two Main Types of Dark Circles
Not all dark circles are created equal. They fall into two broad categories, and each one worsens for different reasons.
Vascular dark circles appear pink, blue, or purple. They’re caused by dilated blood vessels sitting just beneath the thin, translucent skin of the lower eyelid. When blood pools in these vessels or moves sluggishly, the area takes on a bruised look. In more chronic cases, red blood cells leak out of tiny vessels and leave behind iron-based deposits in the skin, which stain the area a darker shade over time.
Pigmented dark circles look brown. These result from excess melanin in both the surface and deeper layers of the skin. UV exposure, chronic rubbing, eczema, allergic skin reactions, and even certain medications (particularly some eye drops used for glaucoma) can all trigger this type of pigmentation. Genetics play a strong role too. Some people simply have more melanin-producing cells concentrated around the eyes, and that distribution is hardwired.
Many people have a combination of both types, which is one reason dark circles can be so stubborn.
How Aging Makes Dark Circles Worse
If your dark circles have been gradually worsening over months or years, aging is likely the biggest factor. Several changes happen simultaneously in the under-eye area as you get older, and they compound each other.
The fat pads that normally sit behind your lower eyelid begin to shift forward and downward as the ligaments holding them in place weaken. At the same time, the bone of the upper jaw slowly resorbs, creating less structural support. The result is a deepening groove called the tear trough, the crescent-shaped hollow that runs from the inner corner of your eye toward the cheek. This groove casts a shadow that looks like a dark circle even when there’s no actual change in skin color. Meanwhile, your skin loses collagen and elasticity, becoming thinner and more translucent with each passing year. Blood vessels that were once hidden become more visible, adding a blue or purple tint on top of the shadow.
These structural changes tend to accelerate in your late 30s and 40s, which is when many people notice their dark circles suddenly look worse than ever.
Allergies and Sinus Congestion
If your dark circles worsen seasonally or flare up alongside a stuffy nose, allergies are a likely culprit. When your immune system reacts to an allergen, the lining inside your nose swells. That swelling slows blood flow in the veins around your sinus cavities, and those veins happen to sit right beneath the skin under your eyes. When they become congested and swollen, the area looks darker and puffier. This is what doctors call “allergic shiners.”
Allergic shiners can become a year-round problem if you’re reacting to dust mites, pet dander, or mold rather than seasonal pollen. The chronic congestion keeps those veins perpetually swollen, making the darkness seem like it never goes away. Rubbing itchy eyes compounds the problem by triggering post-inflammatory pigmentation, essentially training the skin to produce more melanin in that area.
Iron Deficiency and Low Blood Oxygen
When your body doesn’t have enough iron, it can’t produce adequate healthy red blood cells. Those cells carry oxygen, and without enough of them, blood flowing through the vessels under your eyes is darker and less oxygenated than normal. Because the skin there is so thin, this poorly oxygenated blood shows through more visibly, giving the area a dusky, hollow appearance.
Iron deficiency is one of the most common nutritional deficiencies worldwide, and it’s especially prevalent in women with heavy periods, people following restrictive diets, and anyone with chronic digestive conditions that impair nutrient absorption. If your dark circles have worsened alongside fatigue, shortness of breath, or feeling cold easily, low iron levels are worth investigating with a simple blood test.
Sleep, Salt, and Screen Time
Poor sleep doesn’t cause dark circles on its own, but it makes existing ones dramatically more noticeable. When you’re sleep-deprived, your skin becomes paler, which increases the contrast between the under-eye area and the rest of your face. Blood vessels dilate, adding a darker hue. Fluid also pools more readily around the eyes when you’re lying flat for too few or too many hours, creating puffiness that casts additional shadows.
A high-salt diet contributes in a similar way. Excess sodium causes your body to retain fluid, and the loose tissue under the eyes is one of the first places that fluid accumulates. The resulting puffiness doesn’t just make you look tired; it creates shadows that deepen the appearance of dark circles underneath the swollen area. Cutting back on salt and staying hydrated can make a visible difference within days if fluid retention is a major contributor.
Extended screen time is an indirect factor. Staring at screens for long hours strains the muscles around your eyes, increasing blood flow to the area. It also tends to disrupt sleep patterns, creating a cycle that keeps dark circles worsening.
UV Exposure and Skin Damage
Sun exposure is one of the most controllable reasons dark circles get worse over time. Ultraviolet radiation triggers melanin production as a protective response, and the thin skin around your eyes is especially vulnerable. People with a genetic predisposition to pigmentation in this area are particularly affected: UV light can activate dormant pigment-producing cells, darkening the under-eye zone well beyond what was there before.
This kind of sun-driven pigmentation tends to build gradually. You may not notice a change week to week, but over a summer or a year of inconsistent sunscreen use, the cumulative effect is significant. Wearing sunglasses and applying sunscreen (or a mineral-based eye cream with SPF) to the under-eye area helps slow this progression considerably.
What You Can Do About It
The right approach depends on what’s driving your dark circles. Start by identifying your type. Look at the color in natural light: blue or purple suggests a vascular issue, brown points to pigmentation, and a deep shadow that shifts when you tilt your head in different lighting suggests volume loss.
For vascular dark circles, cold compresses constrict dilated blood vessels and can temporarily reduce the appearance. Managing allergies with antihistamines addresses the root cause if congestion is involved. Topical products containing caffeine or vitamin K may help by promoting blood vessel constriction, though results tend to be modest.
For pigmented dark circles, ingredients like vitamin C, niacinamide, and retinoids can gradually reduce melanin production in the skin. Consistent sun protection is non-negotiable. If chronic rubbing from allergies or eczema is the trigger, treating the underlying itch is the first priority.
For volume loss and structural changes, topical products have limited impact because the issue is beneath the skin’s surface. Hyaluronic acid fillers injected into the tear trough can restore lost volume and reduce the shadow effect, though they carry some specific risks in this area. Up to 11% of people who get tear trough fillers experience swelling in the adjacent cheek area because gravity pulls the filler material downward. This is a procedure worth researching carefully and having done by someone experienced with the under-eye area specifically.
Lifestyle changes that address multiple causes at once, sleeping 7 to 9 hours, reducing sodium intake, managing allergies, and wearing sunscreen daily, often produce the most noticeable cumulative improvement, especially when dark circles have multiple contributing factors working together.