A growth on the white of the eye that creeps toward the pupil: pterygium, pinguecula and when to remove it

A small raised patch on the white of the eye, or a pink wedge that seems to creep toward the coloured part, usually sends people to the search box before a doctor. There are two common answers. A pinguecula is a harmless yellowish bump. A pterygium is a growth that crosses onto the cornea and sometimes needs removing. This article sorts the two and explains when surgery is worth considering.

What is the growth on the white of my eye?

Most often it is a pinguecula or a pterygium, both growths of the conjunctiva, the thin clear membrane over the white of the eye. The difference is the cornea, the clear window at the front. A pinguecula stays on the white. A pterygium crosses onto the cornea.

The AAO's EyeWiki describes a pinguecula as a relatively common, non-malignant, raised yellow-white lesion that does not involve the cornea. A Cochrane review defines a pterygium as a fleshy, wing-shaped growth from the conjunctiva, crossing over the limbus onto the cornea. The limbus is the border where the white meets the clear window. A pterygium is fibrovascular, meaning fibrous tissue carrying small blood vessels, which is why it looks pink and fleshy. It is sometimes called surfer's eye, a nickname that says where it comes from.

Neither is a cancer. The question for each is whether it is bothering you or threatening your sight, not whether it is dangerous in itself.

Why do a pterygium and a pinguecula form?

Ultraviolet light is the main driver, helped by wind, dust and dryness. The Cochrane review states that ultraviolet light is a major contributor to the formation of pterygia, and EyeWiki lists UV exposure, wind, dust, an outdoor lifestyle and proximity to the equator as risk factors for a pinguecula.

That describes an ordinary tropical life: bright sun, glare off water or tarmac, motorbike wind, dusty building sites. A 2018 systematic review in Survey of Ophthalmology, covering 68 articles and 415,911 participants from 24 countries, put the global prevalence of pterygium at 12% (95% confidence interval 11 to 14%). It rose from 3% in the 10 to 20 year group to 19.5% in people over 80, and ranged from 0.07% in one clinic-based study to 53% in another, so the figure depends heavily on where and who is counted.

The same review found higher odds of pterygium with sunlight exposure over 5 hours (odds ratio 1.24), outdoor occupations (1.46), rural living (1.45) and male sex (1.30), and lower odds with sunglasses (0.47). These are pooled associations, not a prediction for any one person.

What symptoms do they cause?

Often none, apart from the look. When there are symptoms, they are redness, grittiness, a feeling of something in the eye, watering, burning or itching. A growing pterygium can also blur vision. EyeWiki says most pingueculae are asymptomatic, and the Cochrane review says a pterygium can impair vision, limit eye movements and cause irritation, foreign body sensation and dryness.

The blur has a mechanism. EyeWiki notes that vision is impaired through induced astigmatism, an uneven focusing power that smears the image, or by the growth obscuring the visual axis, the line through the centre of the cornea that you see along. The Cochrane authors add that in some susceptible people it can grow over the entire corneal surface.

Redness comes and goes, flaring with wind, dust or a dry day. Dry eye often travels with it, and my article on dry eyes after fifty and the eyelid margin covers the lid-edge side of that.

Could it be something else?

Yes, which is the main reason to have a new growth looked at once. Most are a pinguecula or pterygium, but a few lesions that look similar are not, and an examination tells them apart better than a photograph.

A conjunctival naevus, a pigmented mole on the surface of the eye, can be mistaken for a growth. Ocular surface squamous neoplasia, a rare condition in which abnormal cells grow on the eye surface, can look like a fleshy pterygium, and EyeWiki lists conjunctival intraepithelial neoplasia among the conditions that can mimic one.

The practical rule is simple. A growth that has sat quietly for years is rarely urgent. A pigmented or fleshy lesion that is growing fast, bleeds, or is changing in colour or surface needs assessment soon, and a surgeon may remove tissue and send it to a laboratory. It is the same logic as for lid lesions, set out in my page on eyelid skin cancer warning signs and the one on eyelid margin naevus.

What helps without surgery, and when should a pterygium be removed?

Lubricating drops, protection from sun, wind and dust, and, in a flare, a short doctor-supervised course of steroid drops. None removes a pterygium, but they can calm an irritated one. EyeWiki lists over-the-counter vasoconstrictor drops, lubricating drops and ointments, and short courses of topical corticosteroids to reduce inflammation, and says long-term steroid use is not recommended. For a pinguecula it gives lubrication with artificial tears and ointment first.

Vasoconstrictor drops whiten the eye by narrowing blood vessels, which makes them tempting. I would rather the redness prompted a question than got switched off. Steroid drops are a medicine, not a lubricant, and belong in a doctor's hands with a stop date.

Sunglasses that block ultraviolet light and a brimmed hat ease the irritation now and cut the exposure that drove the growth. They do not shrink one that is already there.

When it threatens vision, keeps getting inflamed despite treatment, is growing, or restricts how the eye moves. Cosmetic concern is a legitimate reason too, but it should be discussed honestly, because surgery has risks and the growth can return.

EyeWiki gives the indications as persistent irritation resistant to medical therapy, obscuring the visual axis or blurred vision from induced astigmatism, increasing size, or restricted eye movement. The Cochrane review states that surgery is the only effective treatment for a pterygium, though recurrences are common. For a pinguecula, EyeWiki says surgery is considered when it is cosmetically unacceptable or chronically inflamed.

A pterygium that is far from the pupil, not growing and not troubling you can be watched, with checks now and then so that growth toward the visual axis is noticed. If the look bothers you, say so. A fair discussion covers what removal would and would not change and the chance of recurrence.

What does pterygium surgery involve, and will it come back?

The standard operation removes the growth and covers the bare area with a graft of the person's own conjunctiva, called a conjunctival autograft. The graft is held in place with stitches or tissue glue. The reason for the graft is recurrence.

The Cochrane review says that simple excision, which leaves bare sclera (the white wall of the eye) exposed, has been reported to carry a risk of recurrence upwards of 80%, and that excision with a tissue graft has a lower risk. EyeWiki puts the approximate recurrence rate of conjunctival autograft at 5 to 10%, and states that 97% of all recurrences occur in the first year after surgery.

The Cochrane review compared autograft with an amniotic membrane graft, a graft of donor tissue, across 20 studies and 1947 eyes. The risk ratio for recurrence with autograft against amniotic membrane was 0.53 (95% confidence interval 0.33 to 0.85) at 6 months, meaning autograft carried the lower risk, and the authors rated the overall risk of bias as unclear. They found too few studies of mitomycin C, a medicine sometimes used to reduce regrowth, to estimate its effect. EyeWiki says it can reduce recurrence to approximately 10% but increases the risk of corneal or scleral melt, a thinning of the eye wall.

On fixation, a 2024 review in BMJ Open Ophthalmology of 11 randomised trials with 833 participants compared a sutureless, glue-free method with conventional stitches. It found the glue-free method quicker but linked to more graft dehiscence (the graft coming apart) and retraction, with no significant difference in recurrence. I would ask a surgeon what they use and why, rather than which is newest.

EyeWiki lists recurrence, corneal scarring, corneal perforation, strabismus (a squint) and non-healing surface defects among the complications. The Cochrane studies that reported adverse events named granuloma, pyogenic granuloma and raised eye pressure.

What is recovery like, and how do I stop it coming back?

Expect the eye to be red, gritty and watery for a time, with the length varying from person to person. EyeWiki says topical steroids are often used in the initial postoperative period and that people should be followed to monitor for recurrence, which matters because most recurrences show in the first year.

Protection is the part you control. UV-blocking sunglasses and a hat belong in the routine, including on overcast days, because the exposure that caused the growth does not leave with it. Children are worth including, since the damage builds across years: Dr Chan Li Yen writes about sun protection for children's eyes, and for the skin around the eye the Retreat Clinic explains what SPF does not tell you in a tropical climate.

Some signs are not part of normal healing. Sudden or increasing pain, a drop in vision, discharge, or a graft that looks lifted or moved should be seen the same day, by the operating surgeon where possible. If you are unsure who to see first, my page on what an oculoplastic surgeon is and when to see one sets out who does what, and the wider map is in the orbit and thyroid section and my hub article on why eyes look tired.