Skin Science · Women’s Wellness · Research-Backed
Why Do You Have
Dark Circles Under Your Eyes?
The real reasons behind dark circles — backed by research, explained simply. Because knowing the cause is the first step to fixing it.
Here’s the truth most skincare content skips: dark circles aren’t one thing. They have different causes, different appearances, and need different treatments.
Bluish dark circles mean something different from brown ones. Puffy shadows are different from hollow, sunken ones. This guide breaks all of it down — so you can actually fix yours, not just guess.
The 3 Types of Dark Circles
Vascular
Bluish-purple hue. Caused by visible blood vessels through thin skin. Worse in the morning.
Pigmented
Brown or dark tan tone. Caused by excess melanin. Common in deeper skin tones.
Structural
Shadowy, hollow look. Caused by volume loss or deep-set eyes. Age-related.
10 Real Causes — Explained
Filter by type:
The skin beneath your eyes is only 0.5mm thick — four times thinner than skin elsewhere on your face. When blood vessels beneath show through, they create that bluish-purple appearance. It’s the most common structural cause.
Lack of sleep causes blood vessels under the eyes to dilate, creating a darker appearance. The skin also becomes paler from fatigue, making vessels more visible. It’s not just about hours — quality matters too.
Studies show dark circles often run in families. If your parents or grandparents had them, your skin tone, vessel structure, and fat distribution beneath the eyes may be genetically predisposed. This type tends to appear early — even in children.
Iron deficiency reduces red blood cell production, meaning less oxygen reaches skin tissues — resulting in pale, dull, and darkened skin around the eyes. This is more common in women due to menstruation, pregnancy, and dietary habits.
When the body is dehydrated, skin loses its plumpness and the under-eye area appears sunken and dark. The eyes can look dull, tired, and more deeply set than usual. Even mild dehydration shows up quickly around the eyes.
Allergic reactions cause histamine release, which dilates blood vessels. Rubbing itchy eyes worsens inflammation and breaks down capillaries. The resulting discolouration is sometimes called “allergic shiners” by dermatologists.
UV rays trigger melanin production — including in the delicate under-eye area. Over time, unprotected sun exposure leads to hyperpigmentation around the eyes. This type of dark circle is typically brown-toned and more common in women with medium to deeper skin tones.
High stress raises cortisol levels, which can increase inflammation, disrupt sleep, and cause fluid retention — all of which worsen under-eye discolouration. Stress is often an overlooked but very real trigger for persistent dark circles.
As we age, fat pads beneath the eye shrink and skin loses collagen and elasticity. This creates a hollow, shadowed appearance — sometimes called a tear trough. It’s not true pigmentation but rather a structural shadow that worsens with age.
Hypothyroidism causes puffy, swollen tissue including around the eyes, which creates shadowing. Hormonal fluctuations — especially before periods, during pregnancy, or in perimenopause — can also worsen fluid retention and dark circles.
Treating dark circles without knowing their cause is like treating a headache without knowing if it’s dehydration, tension, or blood pressure.
— Principle shared across dermatology practiceQuick: What Type Do You Have?
Look in the mirror under natural light. What colour are your dark circles?
When Should You See a Doctor?
Manage at Home
Caused by lifestyle. Responds to remedies, skincare, hydration, and sleep within weeks.
See a Dermatologist
Persistent despite lifestyle changes. May need prescription creams, chemical peels, or light therapy.
See Your GP First
Accompanied by fatigue, swelling, or unusual pallor — could signal anaemia, thyroid, or allergies.
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