A red spot on the white of your eye is almost always a subconjunctival hemorrhage, which is a small broken blood vessel just beneath the clear membrane covering your eye. It looks alarming but is usually painless and heals on its own within two weeks. Understanding what caused it, and knowing the few situations where a red spot signals something more serious, can save you unnecessary worry.
The Most Common Cause: A Broken Blood Vessel
The white part of your eye is covered by a thin, transparent membrane called the conjunctiva. This membrane is packed with tiny blood vessels that break easily. When one ruptures, blood leaks into the space between the membrane and the white of the eye, creating a vivid red patch that can range from a small dot to a blotch that covers a large portion of the white.
These breaks often happen during moments of brief pressure. Sneezing, coughing, straining on the toilet, vomiting, heavy lifting, or even rubbing your eyes too hard can all do it. Sometimes you wake up with one for no obvious reason. Contact lenses and minor bumps to the eye are common triggers too. The spot itself doesn’t hurt, and your vision stays normal. You might not even notice it until someone points it out or you look in a mirror.
Most of these spots clear up within two weeks as your body reabsorbs the trapped blood. Larger patches can take a bit longer. The spot may shift color as it heals, turning from bright red to yellow or green, similar to a bruise fading on your skin. No treatment is needed. If the area feels slightly scratchy or dry, over-the-counter artificial tears can help with comfort. Avoid rubbing the eye while it heals.
When Broken Blood Vessels Keep Coming Back
A single episode is rarely anything to worry about. But if you’re getting red spots repeatedly, especially if you’re over 50, your body may be telling you something about your cardiovascular health. High blood pressure is the leading systemic cause of these hemorrhages in older adults. Elevated blood pressure makes the tiny vessels in your conjunctiva more prone to bursting, and the resulting spots tend to be larger than those caused by a cough or minor trauma.
Diabetes also plays a role. The disease damages small blood vessels throughout the body, including those in the eye, making them fragile and more likely to rupture. Blood-thinning medications, including aspirin and prescription anticoagulants, increase both the likelihood of a hemorrhage and the time it takes to resolve. If you notice these spots appearing more than once or twice a year, it’s worth having your blood pressure and blood sugar checked. Research suggests that repeated hemorrhages with no clear cause may even predict future hypertension in older patients.
Growths That Can Look Like Red Spots
Not every mark on the white of your eye is trapped blood. Two common growths can cause persistent redness in a localized area, and both are related to long-term sun and wind exposure.
A pinguecula is a small, raised bump on the conjunctiva, usually yellowish or white, that sits on either side of the iris. It contains deposits of protein, fat, or calcium. Most pingueculae don’t affect vision, but in some cases they interfere with the tear film, leading to dryness, irritation, and redness around the growth.
A pterygium, sometimes called surfer’s eye, is a wedge-shaped growth that starts on the conjunctiva but can creep onto the clear front surface of your eye (the cornea). It typically causes a gritty sensation, as if something is stuck in your eye, along with redness and irritation. If it grows large enough to reach the center of the cornea, it can distort your vision. Both conditions develop slowly over months or years, which distinguishes them from the sudden appearance of a broken blood vessel.
Red Spots That Need Urgent Attention
The key distinction is between redness on the surface of the eye and blood or damage deeper inside. A standard subconjunctival hemorrhage sits on the white of the eye, causes no pain, and doesn’t change your vision. If any of the following are present, the situation is different and requires prompt medical evaluation.
- Pain. A painless red spot is typical for a broken surface vessel. Pain suggests the problem may be deeper, involving inflammation, infection, or increased pressure inside the eye.
- Vision changes. Blurred, distorted, or reduced vision means the issue likely isn’t limited to the surface. This can indicate bleeding inside the eye or damage to the cornea.
- Blood pooling in front of the colored part of your eye. This is called a hyphema. Instead of a red patch on the white, you’ll see blood collecting between the cornea and the iris, often settling in a visible layer at the bottom of the colored ring. Hyphemas are medical emergencies because they can raise the pressure inside the eye to dangerous levels and lead to permanent vision loss. They’re usually caused by a direct blow to the eye.
- A white spot on the clear front surface of the eye. This could be a corneal ulcer, an open sore on the cornea often linked to contact lens use or infection. It may appear as a white or grayish dot over the pupil or iris area, not on the white of the eye. Corneal ulcers can worsen rapidly without treatment.
- Nausea and vomiting after eye trauma. These symptoms can signal dangerously high pressure inside the eye and warrant an emergency visit.
How to Tell What You’re Dealing With
Location and symptoms are your best guides. A bright red, flat patch on the white of the eye with no pain and normal vision is almost certainly a harmless broken vessel. A raised, yellowish bump that’s been there for weeks or months is likely a pinguecula or pterygium. Blood visible in front of the iris, or any combination of redness with pain or vision loss, points to something that needs professional evaluation quickly.
If your red spot fits the typical pattern of a subconjunctival hemorrhage, you can safely wait it out. Use artificial tears if it feels irritated, avoid rubbing the eye, and watch for it to fade over the next one to two weeks. If it hasn’t cleared after three weeks, or if new spots keep appearing, schedule an eye exam to rule out underlying causes like uncontrolled blood pressure or a clotting issue.