A red spot on the white of your eye is almost always a subconjunctival hemorrhage, a tiny broken blood vessel just beneath the clear membrane covering your eye. It looks alarming, but it’s painless, doesn’t affect your vision, and clears up on its own within about two weeks. Less commonly, a red spot can signal something that needs attention, so it’s worth knowing the differences.
Why Blood Vessels Break in Your Eye
The conjunctiva, the thin transparent membrane over the white of your eye, is packed with tiny blood vessels. When one of them bursts, blood gets trapped underneath and spreads into a bright red patch. Because the blood sits on the surface and not on your cornea or inside the eye, your vision stays completely normal. You can’t wipe the blood away or move it around. It’s stuck there until your body reabsorbs it.
The most common triggers are surprisingly mundane:
- Straining from coughing, sneezing, vomiting, or bearing down on the toilet
- Rubbing your eye too hard
- Wearing contact lenses
- Minor eye injury or irritation
Sometimes there’s no identifiable cause at all. You wake up, look in the mirror, and there it is. That’s normal and not a reason for concern on its own.
Blood Thinners and Other Risk Factors
If you take a blood thinner like warfarin, rivaroxaban, or apixaban, you’re more likely to experience bleeding in the eye. A large analysis of the World Health Organization’s global drug safety database found a strong association between both older and newer blood thinners and eye bleeding events. This doesn’t mean you should stop your medication, but it does explain why these spots may keep coming back.
High blood pressure, diabetes, and blood clotting disorders also increase your risk. People who’ve recently had eye surgery, such as cataract removal, are more prone to broken blood vessels as well. If you notice red spots appearing repeatedly, it’s worth having your blood pressure checked, since frequent hemorrhages can be a sign it’s running too high.
What Healing Looks Like
Most subconjunctival hemorrhages clear up within two weeks without any treatment. As the blood reabsorbs, the color shifts through stages, much like a fading bruise. It may go from bright red to brownish-yellow before disappearing entirely. No drops, medications, or special care are needed.
If the spot feels mildly irritated or scratchy, over-the-counter artificial tears can help with comfort. Avoid rubbing the eye, which can slow healing or cause another hemorrhage. There’s nothing you can do to speed up the process.
Red Spots That Aren’t a Broken Blood Vessel
Not every red spot is a simple hemorrhage. A few other conditions can look similar but behave very differently.
Episcleritis causes a patch of redness in one area of the eye. It typically doesn’t hurt and doesn’t cause light sensitivity. It’s an inflammation of the thin tissue between the conjunctiva and the white of the eye. It’s usually mild and resolves on its own, though it can recur.
Scleritis looks similar to episcleritis but is far more serious. The key difference is pain: scleritis causes a deep, boring ache that can wake you from sleep, along with sensitivity to light. The redness may have a blue-violet tint. This condition requires prompt treatment to prevent vision damage.
Pinguecula and pterygium are raised growths on the conjunctiva that can appear as yellowish-white bumps or wedge-shaped tissue extending toward the cornea. These aren’t red spots exactly, but they can become irritated and inflamed, making the surrounding area look red. They’re caused by long-term sun and wind exposure and are sometimes called “surfer’s eye.”
Signs That Need Immediate Attention
A painless red patch with normal vision is almost certainly harmless. But certain symptoms alongside a red eye point to something more serious. You should seek same-day care if you experience any of the following:
- Blurred or reduced vision in the affected eye
- Deep, aching pain in or behind the eye
- Sensitivity to light (photophobia)
- Halos around lights seen from one eye
- Nausea or vomiting along with eye pain
- Blood pooling in front of the colored part of your eye (iris), especially after an injury
Blood collecting in the front chamber of the eye, between the cornea and iris, is called a hyphema. It usually follows a direct blow to the eye and is a medical emergency. Unlike a surface hemorrhage, a hyphema can raise the pressure inside your eye to dangerous levels and cause permanent damage if untreated.
Reduced vision combined with deep eye pain can signal acute glaucoma, an inflammation inside the eye called uveitis, or scleritis. All three require urgent evaluation by an ophthalmologist. The combination of these symptoms is the critical distinction: a broken blood vessel alone never causes pain or vision changes.