A red patch in the corner of your eye is most often caused by a burst blood vessel, minor irritation, or dryness. These are common and usually harmless. The location matters, though. Redness isolated to the inner corner (near your nose) has a slightly different set of causes than redness in the outer corner, and a few patterns signal something that needs medical attention.
Burst Blood Vessel
The most common cause of a sudden, bright red patch in one corner of the eye is a subconjunctival hemorrhage, which is a tiny blood vessel that has broken beneath the clear surface layer of your eye. It looks alarming: a sharply outlined area of bright red or crimson against the white of the eye. But it’s painless, doesn’t affect your vision, and you may not even notice it until you look in a mirror.
These happen from sneezing, coughing, straining, rubbing your eyes, or sometimes for no obvious reason at all. The red patch goes through a predictable color change as your body reabsorbs the blood. It stays bright red for the first one to five days, then shifts to purple, brown, or greenish-yellow between days five and ten. Most cases clear completely within 7 to 14 days, though larger spots can take up to three weeks. No treatment is needed.
Dry Eye and Tear Film Problems
If the redness in the corner of your eye isn’t a distinct red patch but more of a persistent pinkness with irritation, dry eye is a likely culprit. When your tear film breaks down or becomes unstable, the exposed surface triggers inflammation. That inflammation causes blood vessels on the white of your eye to dilate, creating visible redness. The corners of the eye are particularly vulnerable because tears naturally drain toward the inner corner and pool less effectively at the outer edges.
Dry eye redness tends to come and go. It’s often worse after long stretches of screen time, in air-conditioned or heated rooms, or on windy days. You might also notice a gritty or burning sensation. Preservative-free artificial tears can help, and reducing screen time or using a humidifier often makes a noticeable difference.
Growths Near the Corner
A small yellowish or white bump on the white of the eye, usually on the side closest to the nose, is called a pinguecula. It’s a buildup of protein, fat, or calcium deposits on the conjunctiva. Pingueculae are extremely common, especially in people who spend a lot of time outdoors. They can become inflamed and red periodically, particularly after UV exposure, wind, or dust irritation.
If that growth starts extending onto the clear front surface of your eye (the cornea), it’s called a pterygium, sometimes known as surfer’s eye. Pterygia are wedge-shaped and tend to cause more persistent irritation, a foreign-body sensation, and redness. In advanced cases, they can distort vision by changing the shape of the cornea. Both conditions are driven by UV exposure. Wearing wraparound sunglasses and limiting time in dusty or windy environments helps prevent them from progressing.
Inner Corner Inflammation
If the redness is specifically in the fleshy pink bump at the very inner corner of your eye (the caruncle), the cause could be localized inflammation or a blocked gland. That small nodule contains hair follicles, oil glands, and sweat glands, any of which can become irritated or infected. A blocked oil gland in this area can swell and redden, sometimes forming a small cyst. These episodes are typically mild and resolve on their own, though warm compresses can help.
Persistent or growing lumps on the caruncle are rare but worth getting checked, since the tissue there is diverse enough to produce a wide variety of lesions.
Episcleritis
Episcleritis is inflammation of the thin layer of tissue between the white of your eye and the clear outer membrane. It typically shows up as a well-defined patch of redness in one section of one eye, which is why it can look like a red corner. It comes on quickly and may cause mild tearing and light sensitivity, but little to no actual pain. That’s the key difference from its more serious relative, scleritis, which causes deep, boring eye pain and tenderness.
Episcleritis often clears on its own within a week or two. Lubricating eye drops and over-the-counter anti-inflammatory pain relievers can ease discomfort. If the redness keeps coming back or is accompanied by real tenderness when you press gently on the eye, an eye doctor should evaluate it to rule out scleritis.
Contact Lens Irritation
If you wear contact lenses, especially extended-wear lenses, redness in one corner of the eye could signal a reaction at the edge of the lens. Contact lenses can cause small inflammatory spots near the border where the cornea meets the white of the eye. These are driven by reduced oxygen reaching the cornea or by a sensitivity to preservatives in your lens solution. The redness is usually accompanied by mild discomfort and may worsen the longer you keep your lenses in. Switching to daily disposable lenses or a preservative-free solution often resolves the problem.
When Corner Redness Is a Warning Sign
Most causes of redness in one corner of the eye are benign. But certain combinations of symptoms point to something more serious. Seek prompt medical attention if your redness comes with any of the following:
- Sudden vision changes, including blurriness, double vision, or seeing halos around lights
- Significant eye pain, not just mild irritation, especially deep or aching pain
- Sensitivity to light that makes it hard to keep your eye open
- A severe headache, nausea, or fever alongside the redness
- Swelling in or around the eye that limits your ability to open it
- A chemical splash or foreign object that preceded the redness
Painless redness with normal vision is rarely an emergency. If the redness persists beyond two to three weeks, keeps recurring, or gradually worsens, an eye exam can identify the underlying cause and rule out conditions that benefit from treatment.