Redness in the inner corner of your eye is usually caused by minor irritation, allergies, or dryness, though infections and small growths can also be responsible. This spot is home to delicate, highly vascular tissue that reacts quickly to irritants, making it one of the first places to show visible redness when something is off.
What Sits in the Inner Corner of Your Eye
The inner corner contains two small but important structures. The first is a crescent-shaped fold of tissue called the plica semilunaris, and just inside that sits a small, fleshy mound called the caruncle. Both are covered by conjunctiva, the thin, clear membrane that lines the white of your eye and the inside of your eyelids. This membrane sits on top of loose connective tissue packed with tiny blood vessels. When those vessels dilate from irritation, infection, or inflammation, you see redness concentrated right at that inner corner.
Your tear drainage system also opens here. Tiny puncta (openings) at the inner edge of each eyelid funnel tears into small canals that drain into the tear sac, which sits in the bone beside your nose. A problem anywhere along this drainage pathway can produce swelling, redness, and discharge that looks like it’s centered on the inner corner.
Allergies: The Most Common Culprit
If both eyes are red, itchy, and watery, especially during certain seasons, allergies are the most likely explanation. Allergic reactions cause the conjunctiva to swell and the blood vessels beneath it to dilate, producing a puffy, pink-to-red appearance. The inner corner often looks worst because you instinctively rub there when your eyes itch, which increases the irritation.
Allergic eye reactions are typically bilateral, meaning they affect both eyes, though one side may flare first. Seasonal patterns, a personal history of hay fever or eczema, and intense itching all point toward allergy rather than infection. Over-the-counter antihistamine eye drops usually bring relief within minutes, and cool compresses can reduce swelling.
Dry Eye and Environmental Irritation
Dry eye tends to be a chronic, slow-building problem. When your eyes don’t produce enough tears or the tears evaporate too quickly, the conjunctiva becomes irritated, and the inner corner can look persistently pink or red. You might also notice a gritty, sandy feeling, especially later in the day or after long screen time.
Wind, dust, dry indoor air, and prolonged contact lens wear all make this worse. If you’ve had red, tired-feeling eyes for weeks or months without any discharge or crusting, dry eye is a strong possibility. Preservative-free artificial tears used several times a day are the standard first step. A warm, damp washcloth held over closed eyes for five to ten minutes can also help by loosening oils in your eyelid glands that keep tears from evaporating.
Tear Duct and Canal Infections
When the tear drainage system gets blocked, bacteria can multiply inside it and cause infection. Two types stand out:
Dacryocystitis is an infection of the tear sac itself. It produces pain, swelling, and redness or skin darkening right beside the nose, just below the inner corner. Pressing on the swollen area may push discharge back out through the puncta. It can come on suddenly with significant pain, or develop gradually with milder, recurring symptoms.
Canaliculitis is an infection of the tiny drainage canal that connects the punctum to the tear sac. It causes redness concentrated at the inner corner, a swollen or “pouting” punctum that looks like a small raised dot, watery eyes, and cloudy discharge. It’s often mistaken for standard conjunctivitis, but the key difference is that the redness and swelling are very localized to one spot rather than spread across the whole eye.
Both of these infections need treatment from an eye care provider. Warm compresses can ease discomfort in the meantime, but antibiotics are typically needed to clear the infection, and a blocked duct may need to be opened with a minor procedure.
Growths on the Inner Eye Surface
A pinguecula is a small, yellowish-white bump that forms on the conjunctiva, most often on the inner side of the eye near the nose. It’s made up of protein, fat, or calcium deposits that accumulate after years of sun, wind, and dust exposure. Pingueculae themselves are harmless and extremely common, but they can become inflamed, a condition called pingueculitis, which makes the area around the bump look red and feel irritated.
People who spend a lot of time outdoors, have dry eye disease, or wear contact lenses are more likely to develop them. If you notice a small raised spot on the white of your eye near the inner corner that sometimes gets red and irritated, this is a likely explanation. Lubricating drops and sunglasses that block UV light help prevent flare-ups. Pingueculae rarely need removal unless they’re causing persistent discomfort.
Bacterial and Viral Conjunctivitis
Infections of the conjunctiva itself can make the entire white of the eye red, but the inner corner often looks worst because that’s where discharge collects. The type of discharge helps you tell bacterial from viral:
- Bacterial conjunctivitis produces thick, yellowish or greenish discharge that crusts your eyelids shut overnight. The redness is pronounced, and the eye feels sore rather than itchy.
- Viral conjunctivitis produces a thinner, watery discharge and often starts in one eye before spreading to the other within a day or two. Itching is more prominent, and you may have had a recent cold or upper respiratory infection.
Bacterial conjunctivitis often improves with antibiotic drops, while viral conjunctivitis has to run its course over one to two weeks. Cool compresses and artificial tears help with comfort for both types. Frequent handwashing prevents spreading it to others or to your other eye.
How to Tell These Causes Apart
The combination of symptoms you have alongside the redness is what narrows down the cause:
- Itching in both eyes, seasonal pattern: allergies
- Gritty feeling, worse with screens or dry air, long history: dry eye
- Thick yellow discharge, crusting, pain: bacterial infection
- Watery discharge, started in one eye, recent cold: viral infection
- Painful swelling right beside the nose: tear sac infection
- Localized swelling at the inner corner with cloudy discharge: canaliculitis
- Yellowish bump that sometimes flares red: pinguecula
When Inner Eye Redness Signals Something Serious
Most causes of inner corner redness are treatable and not dangerous. However, a few warning signs point to conditions that need urgent attention. Vision loss, severe pain with eye movement, a bulging eye, or fever alongside eye swelling can indicate orbital cellulitis, an infection that has spread into the deeper tissues around the eye. This is a medical emergency. Preseptal cellulitis, a less severe infection limited to the eyelid skin, causes redness and swelling but does not affect vision or eye movement.
If your redness came on suddenly with intense pain, if your vision is blurry or worsening, or if the area is becoming more swollen despite home care, get it evaluated promptly rather than waiting to see if it resolves on its own.