A red spot on the white of your eye is almost always a subconjunctival hemorrhage, a tiny broken blood vessel just beneath the clear surface membrane of your eye. It looks alarming but is usually painless and heals on its own within about two weeks. That said, not every red spot is a simple burst vessel. Understanding the differences helps you figure out whether you can wait it out or need to get checked.
The Most Common Cause: A Burst Blood Vessel
The conjunctiva, the thin transparent tissue covering the white of your eye, contains dozens of tiny blood vessels. When one of them breaks, blood pools underneath and forms a bright red patch that can range from a small dot to a large blotch covering much of the white. Unlike bloodshot eyes where you see a web of pink or red lines, a subconjunctival hemorrhage looks like a solid, well-defined area of deep red.
Common triggers include sneezing, coughing, vomiting, straining on the toilet, heavy lifting, rubbing your eye too hard, or wearing contact lenses. Blood-thinning medications also raise the risk. Less commonly, high blood pressure, diabetes, or blood clotting disorders contribute. In many cases, there’s no identifiable trigger at all.
The spot itself doesn’t hurt and doesn’t affect your vision. As your body reabsorbs the blood over one to two weeks, you may notice the color shifting from bright red to a yellowish tinge before it disappears completely. Larger spots can take a bit longer to clear.
What to Do While It Heals
No treatment is needed for a typical burst blood vessel. If your eye feels scratchy or dry, over-the-counter artificial tears can help with comfort. You can also apply a cold compress in the first day or two. Avoid redness-relieving eye drops, as these are designed for a different problem and won’t speed healing. If you take blood thinners and notice these spots happening repeatedly, it’s worth mentioning to your doctor.
Other Causes of Red Spots or Patches
While a burst vessel is the most likely explanation, a few other conditions can create redness on or around the eye’s surface. The key differences come down to pain, location, and whether your vision is affected.
Episcleritis
This is inflammation of the thin layer of tissue between the conjunctiva and the tough white wall of the eye. It produces a localized patch of redness, often in one section of the eye, and typically causes no pain. It’s generally not a threat to your vision and often resolves without treatment, though it can recur. Scleritis, a deeper and more serious version of this inflammation, causes severe aching pain that can wake you from sleep, along with light sensitivity. Scleritis carries a real risk of vision loss and needs prompt medical attention.
Pinguecula and Pterygium
These are small growths on the conjunctiva caused by long-term UV exposure, wind, and chronic dryness. A pinguecula appears as a small, raised, white or yellowish bump on the white of the eye, usually near the inner or outer edge of the iris. A pterygium (sometimes called surfer’s eye) is a wedge-shaped growth that can extend from the white of the eye onto the clear cornea covering your iris. Both can become red and irritated. They’re not dangerous in most cases, but a pterygium that grows over the cornea can eventually affect vision.
Corneal Ulcer
Contact lens wearers should be aware of corneal ulcers, open sores on the cornea that cause redness along with eye pain, light sensitivity, watery eyes, blurred vision, and a feeling like something is stuck in your eye. A white or gray spot may appear on the cornea, though it can be difficult to see without magnification. Corneal ulcers need treatment to prevent permanent damage.
Signs That Need Prompt Attention
A painless red patch with no vision changes and no discharge is the hallmark of a harmless burst vessel. But certain symptoms alongside redness signal something more serious. Get your eye checked promptly if you experience any of the following:
- Vision changes: any loss of vision, blurriness, gray or black spots, or floating webs in your field of view
- Severe pain: a deep ache in or behind the eye, especially pain that disrupts sleep
- Light sensitivity: discomfort or pain when looking at light
- Trauma: the redness followed a hit to the eye, a scratch, or contact with a chemical or foreign object
- Systemic symptoms: nausea, vomiting, headache, or dizziness accompanying eye redness
If you keep getting subconjunctival hemorrhages without obvious triggers like sneezing or straining, it’s worth having your blood pressure checked and mentioning the pattern to your doctor. Recurrent episodes can occasionally point to uncontrolled hypertension or a clotting issue that’s worth investigating.