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Pterygium and pinguecula: that yellow or filmy patch on your eye
Last updated: 20 August 2026
You spot it in the mirror or someone points it out: a yellowish patch on the white of your eye, or a triangular film creeping from the corner towards the coloured part. Usually it is a pinguecula or a pterygium — benign growths with a strong preference for sunny lives. What it is, what it does, and when to have something done about it.
In short
- A pinguecula is a yellowish thickening on the conjunctiva; a pterygium a wing of tissue growing onto the cornea.
- Both are benign and linked to years of UV light, wind and dust.
- Usually artificial tears and sunglasses suffice; surgery only comes into play with growth towards the pupil zone, marked symptoms or cosmetic bother.
- A removed pterygium can recur; modern techniques (with a conjunctival graft) strongly reduce that chance.
⚠ Acute symptoms?Sudden vision loss, an eye injury, chemicals in the eye, severe pain, or new blind spots in your visual field? Don't wait for an online explanation — call your GP (huisarts), the out-of-hours GP service, or 112 immediately.
Two related patches
The pinguecula is a small, yellowish, slightly raised patch on the conjunctiva, usually on the nose side of the eye white, that does not grow onto the cornea. It is a thickening of conjunctival tissue — a kind of callus of the eye. The pterygium goes a step further: a vascular, triangular membrane that does creep across the corneal edge, its apex pointing at the pupil. Its nickname 'surfer's eye' betrays the cause.
Where do they come from?
The common thread is chronic irritation of the ocular surface, with UV light in the lead role and wind, dust and dryness as supporting cast. Hence both patches are more common in people who live outdoors a lot — on the water, in the mountains, in sunny countries — and usually sit on the nose side, where reflected sunlight strikes the eye extra. They are not contagious, not cancer, and do not become it; a patch that looks different (pigment, fast growth, small bleeds) can however be a reason for a professional look.
What complaints do they cause?
Often none. What can occur: a grain-of-sand feeling, redness and irritation in wind, air conditioning or dry air (the raised patch disturbs the tear film), and with a growing pterygium: increasing astigmatism as the membrane pulls on the cornea — the image gradually becomes more restless. If a pterygium advances far towards the centre it can eventually reach the pupil zone and hinder vision directly; nowadays it is rarely allowed to get that far.
What can you do?
The basis is protecting and lubricating: good sunglasses (UV400, ideally wrapping at the sides) curb the stimulus that feeds the patch, and artificial tears damp the irritation. For a red, flared-up pinguecula a doctor can give short-course anti-inflammatory drops. For most people, that settles it.
Surgery is a considered choice, not an automatism. Good reasons: a pterygium demonstrably growing towards the pupil zone, increasing astigmatism, persistent irritation unresponsive to drops, or substantial cosmetic bother. The modern standard is removal with the defect covered by a patch of the patient's own conjunctiva (autograft) — a technique that has sharply lowered recurrence compared with simple stripping. A recurrence remains possible, especially in young people and with continued sun exposure; sunglasses remain the best advice even after surgery.
Frequently asked questions
Can a pinguecula grow into a pterygium?
They share the same cause and a pinguecula can be the base of a pterygium, but most pingueculae simply remain what they are: a stable yellow patch.
Does a pterygium go away by itself?
No. It can stay stable for a long time and the redness can come and go, but the membrane itself does not vanish spontaneously. Only surgery removes it — and surgery is far from always needed.
Is the operation painful and what is the recovery?
The procedure is done under local anaesthetic and typically takes half an hour. The eye feels irritated and red for the first days; that settles in one to two weeks. Full conjunctival healing takes a few weeks.
My patch occasionally flares bright red. Is that bad?
A pinguecula or pterygium can inflame periodically — bothersome but harmless, and well dampened with artificial tears or a short course of anti-inflammatory drops. If redness persists or pain or reduced vision joins in, have it assessed.
Sources and further reading
This article is general explanation, not medical advice about your situation. For acute symptoms: call your GP, the out-of-hours GP service, or 112.