Pinguecula vs Pterygium: What Is That Growth on My Eye?
Reviewed by Dr. Brandon Baker, OD
A pinguecula is a small yellowish bump that stays on the white of the eye and rarely affects vision. A pterygium is a fleshy, wedge-shaped growth that can spread onto the clear cornea and blur vision. Both are linked to UV, wind and dust exposure, and an eye exam tells them apart.
TL;DR
- A pinguecula stays on the white of the eye; a pterygium can spread onto the cornea and affect vision.
- Both come from the same cause: cumulative UV, wind and dust exposure.
- Treatment for both usually starts with monitoring or lubricating drops; only a pterygium sometimes needs surgery.
- A quick slit-lamp exam is the easiest way to tell which one you have.
You catch a glimpse in the mirror or a photo and notice it: a small yellowish or pinkish patch on the white of your eye that wasn’t there before. It’s a common enough question in our Squamish clinic that we hear some version of it every week — “what is this, and should I be worried?” Most of the time, the answer is one of two very similar-looking, closely related conditions: a pinguecula or a pterygium. Here’s how to tell them apart.
How Can You Tell a Pinguecula From a Pterygium?
| Pinguecula | Pterygium | |
|---|---|---|
| Where it grows | White of the eye only | White of the eye, can spread onto the cornea |
| Look | Small, raised, yellowish bump | Fleshy, wedge-shaped, often with visible blood vessels |
| Affects vision? | Rarely | Can, if it grows onto the cornea |
| Tends to grow? | Usually stays the same | Can keep advancing, especially without UV protection |
| Usual care | Monitoring, lubricating drops | Monitoring, drops; surgical referral if it affects vision |
The two can be hard to tell apart in a mirror. If you’re not sure which one you have, your Squamish optometrist can tell with a quick slit-lamp exam. It’s a completely normal reason to book an evaluation rather than guess.
What Causes a Pinguecula and a Pterygium?
The same handful of factors drive both conditions: cumulative UV exposure, wind, dust, and chronic dry eye. It’s why we see both so often in patients who spend a lot of time outdoors around Squamish — on the water, on exposed trail sections, or commuting by bike along a windy stretch of highway. Neither condition is caused by anything you did wrong; it’s simply cumulative environmental exposure over time.
Wearing wraparound, UV-blocking sunglasses whenever you’re outside for extended periods is the single most effective way to lower your risk of either one.
Does Treatment Differ for a Pinguecula and a Pterygium?
Somewhat. Both typically start with the same conservative approach — monitoring if it’s stable, and lubricating drops if it’s causing irritation or dryness. Where they diverge is the ceiling: a pinguecula rarely needs surgery, while a pterygium sometimes does, if it’s advancing toward the visual axis or causing persistent discomfort drops can’t manage. Our full breakdown of pterygium causes, prevention and treatment covers that surgical pathway in more detail if that’s the situation you’re in.
Should You See an Eye Doctor?
Yes — any new growth on the eye is worth having examined, even if it turns out to be the more benign pinguecula. It rules out anything else that can look similar on the surface of the eye, gives you a baseline to track any future change against, and lets us talk through UV protection before it becomes a bigger issue.
Frequently Asked Questions
Does a pinguecula turn into a pterygium?
Not always, but it can in some people, especially with continued UV and wind exposure. That’s part of why it’s worth having either one monitored rather than ignored.
Which one is more common?
Pinguecula is generally the more common of the two.
Can I have both at the same time?
Yes, it’s possible to have a pinguecula in one area and a pterygium developing in another, since both come from the same underlying UV and wind exposure.
Do you diagnose this near Squamish?
Yes — our downtown Squamish clinic near Save On Foods evaluates growths like these for patients across the Sea to Sky Corridor, usually with a same-visit answer.
Not sure whether that spot on your eye is a pinguecula, a pterygium, or something else entirely? Book an appointment at Garibaldi Eye Care in downtown Squamish — we’d love to take a look.
Source
Medical background for this article was checked against the American Academy of Ophthalmology’s overview of pinguecula and pterygium (aao.org).
Medical Disclaimer: This page is for informational purposes only and does not replace professional medical advice. Please consult your optometrist for personalized care.
