A pinguecula (pin-GWEK-yoo-lah) is a small, yellowish or white bump that forms on the conjunctiva, the clear tissue covering the white of your eye. It typically appears on the side closest to your nose and is made up of deposits of protein, fat, or calcium. Pingueculae are extremely common, affecting nearly half of adults over 40, and they’re almost always harmless.
How Common Pingueculae Are
Most people think of a pinguecula as unusual because they’ve never heard the term, but the growths themselves are remarkably widespread. A population study of adults aged 40 and older found that 47.9% had at least one pinguecula. The prevalence climbs with age: about 38% in people in their 40s, rising to nearly 60% by the 70s. Men are more likely to develop them than women, with rates of 56% versus 43% in that same study.
Because many pingueculae are small and cause no symptoms, plenty of people have one without ever noticing it.
What Causes a Pinguecula
The primary driver is ultraviolet light exposure. Over years, UV radiation damages the proteins in the conjunctival tissue, causing a type of degeneration where the fibers break down and clump together. These damaged deposits sometimes include fat or small calcified globules. Researchers have also found that UV exposure creates certain chemical byproducts in the tissue that may reflect how much cumulative sun damage has occurred.
Pingueculae tend to appear on the nasal side of the eye because the nose reflects sunlight onto that area, concentrating the UV dose on a small spot of tissue. Other environmental irritants, including wind, dust, sand, and dry air, contribute to the process. People who work outdoors for long periods are at higher risk.
Contact lens wear is another risk factor. The constant friction and low-grade inflammation from the lens edge rubbing against the conjunctiva can trigger earlier development of a pinguecula.
What It Looks and Feels Like
A pinguecula looks like a small, raised, fleshy bump on the white of your eye. It’s usually yellowish or white and may start as just a colored spot before gradually forming into a more noticeable lump. It sits on the conjunctiva and does not grow onto the clear front surface of the eye (the cornea).
Most pingueculae cause no symptoms at all. When they do become irritated or inflamed, a condition called pingueculitis, you may notice redness around the bump, a gritty or burning sensation, and increased tearing. Pingueculitis tends to flare up during dry, windy, or dusty conditions, or after extended screen time when you blink less and your eyes dry out.
Pinguecula vs. Pterygium
These two conditions share the same causes and can look similar, but they differ in one important way. A pinguecula stays on the conjunctiva and never crosses onto the cornea. A pterygium is a fleshy, blood-vessel-rich growth that may actually start as a pinguecula but then extends onto the cornea. If a pterygium grows large enough, it can distort vision by pulling on the corneal surface or physically blocking the line of sight. A pinguecula, by contrast, does not affect vision.
How It’s Diagnosed
An eye doctor can identify a pinguecula during a routine eye exam, typically using a slit lamp, which is a specialized microscope with a bright light that lets them examine the surface structures of the eye up close. No biopsy or imaging is needed. The diagnosis is straightforward based on the bump’s appearance, color, and location.
Treatment Options
Most pingueculae need no treatment. If yours isn’t bothering you, there’s nothing that needs to be done.
For mild irritation or dryness, over-the-counter lubricating eye drops (artificial tears) are the first step. They reduce the gritty feeling and keep the eye surface moist. If the pinguecula becomes inflamed and red, a short course of prescription anti-inflammatory eye drops can help bring the swelling down.
Surgical removal is rarely necessary. It’s generally only considered when a pinguecula causes persistent discomfort that doesn’t respond to drops, interferes with contact lens wear, or is cosmetically bothersome enough that someone wants it removed. Because a pinguecula is benign and doesn’t threaten vision, the decision to remove it is largely about quality of life rather than medical urgency.
Protecting Your Eyes
Since UV exposure is the main cause, sunglasses are the most important preventive measure. Not all sunglasses offer the same protection, though. Standard fashion sunglasses, even with UV-blocking lenses, still allow roughly 20% of the UV dose to reach the eye because light enters from the sides and reflects off the back of the lenses. Wraparound sunglasses with wide temples cut that figure down to about 2%.
For the best protection, look for frames that wrap close to the face and lenses that are polarized and back-coated (so stray light that enters from the side passes through rather than bouncing into the eye). Lenses rated UV400, which block both UVA and UVB rays, provide the most complete filtering. UV damage to the eyes can happen anytime the sun is up, not just on high-UV-index days, so wearing protective eyewear throughout the day matters more than checking the UV forecast.
Keeping your eyes lubricated in dry or windy environments, wearing protective eyewear during dusty or sandy activities, and giving your eyes breaks from contact lenses all help reduce the irritation that contributes to pinguecula formation and growth.