Epicanthoplasty (inner corner surgery): what the epicanthal fold is, what the operation changes, and the scar and over-correction risks

The inner corner of the eye is the smallest stage on the face and one of the least forgiving. Epicanthoplasty, surgery to the fold of skin that covers it, is often asked about alongside double eyelid surgery, and the papers describing it keep returning to one thing: the scar. This article explains what the fold is, why it is normal, what the operation changes, the families of technique in the literature, and the risks that matter before anyone decides.

What is the epicanthal fold, and is it a problem?

The epicanthal fold is a crescent of eyelid skin at the inner corner of the eye that partly or wholly covers the small pink pool of tears there, called the lacrimal lake. It is normal anatomy, common in East and South-East Asian eyes, and it needs no treatment for health.

A review of epicanthoplasty describes the fold as a semilunar, medial extension of the eyelid skin. An older text on Asian upper blepharoplasty links it to a lack of dermal attachments to the medial canthal ligament, the strong band that anchors the inner corner of the lids. The classic description by Duke-Elder names four types, depending on where the fold starts: from the eyebrow, from above the tarsal plate of the upper lid, from the tarsal fold itself, or from the lower lid. The last, epicanthus inversus, is associated with some genetic syndromes, which I return to near the end.

For most adults the fold is a feature, not a fault. Whether it is a feature a person wants to change is a personal and aesthetic question, and it deserves a calm, unhurried answer.

Why do a child's eyes look crossed when the fold is prominent?

Because the fold, together with a flat nose bridge, changes how the inner corner looks, and the eyes can seem to turn in when they do not. This is called pseudostrabismus, a false squint, and it is not an eyelid problem.

My colleague Dr Chan Li Yen explains this in her article on why a baby can look cross-eyed in photographs when it is the nose bridge. As the face grows and the bridge of the nose builds up, the look often fades, while a true squint is not outgrown and needs checking. That is the reason surgery to the fold is not a childhood remedy for crossed-looking eyes. A child who looks cross-eyed needs an eye examination first.

Why do people ask for inner corner surgery?

Usually because the fold changes how the eye shape reads, or because they want a particular style of double eyelid. The Asian blepharoplasty literature describes epicanthoplasty as recommended mainly for prominent folds, and as an option for milder folds in someone who wants an open-type upper lid crease.

The two operations interact. The fold sits next to the start of the crease, so a high, parallel crease and a fold that hides the inner corner can fight each other. That is why the request often comes together with double eyelid surgery, and why a surgeon assesses them together. How the crease itself is decided is in my article on double eyelid surgery for Asian eyes, and the wider operation is described in the upper blepharoplasty guide.

The same text carries a warning worth repeating: anyone having epicanthoplasty should be told about the possibility of a visible scar at the inner corner. The request is a reasonable one, and so is a decision to leave the fold alone.

What does the operation change, and what techniques are described?

It releases the tension that holds the fold and redraws the skin so the inner corner is more open. The distance between the inner corners, the intercanthal distance, is a common thing to measure. The details differ, and this article describes them as the papers do, without ranking them.

A 2025 review covered 85 publications from 1984 to 2025. It groups techniques into skin redraping, a subcutaneous approach, Y-V epicanthoplasty, Z-epicanthoplasty and a long tail of other and combined methods. Z-epicanthoplasty is the most published, with 23 studies. In Z-plasty, a Z-shaped incision lets two triangles of skin swap places, which lengthens the skin vertically and lets the fold open. In skin redraping, the incisions are kept within the margins of the inner corner and the tissue beneath is disrupted so the skin can settle in a new position. Whichever name is used, the shared steps are releasing the fibromuscular bands that tether the fold and closing without tension.

Two things stand out in the evidence. One is that comparisons are thin: the review notes that there are no prospective comparative trials. The other is that results from one surgeon's series and from pooled studies do not line up neatly. One team's 2025 report of 116 patients treated with skin redraping describes scars as inconspicuous at three years. A 2026 meta-analysis of 14 studies, 1,539 patients and all from China, found Z-plasty ahead on a scar scale at six months and on recurrence, with very high variation between studies and follow-up of only one to six months. Taken together, that is a field still working things out, not a verdict on any technique.

What are the risks, in particular scarring and over-correction?

The principal risk is a scar that shows, followed by an inner corner opened too far, an uneven pair, webbing and a fold that returns. All are described in the papers.

Scar. The review names hypertrophic scarring, a raised, thick scar, as the principal complaint, and visible scars from incisions medial to the inner corner. It also notes a predisposition to hypertrophic scarring in Asian populations, and suture granulomas, small inflamed lumps around buried stitches. Techniques that release tension and avoid the thicker skin of the nose side are described as improving the scar.

Over-correction. The 116-patient report states that an overcorrected epicanthoplasty can lead to overexposure of the caruncle, the small pink fleshy mound at the inner corner, and an aggressive appearance. Skin that has been released and moved cannot simply be put back, which is one reason to be cautious about asking for more.

Webbing and recurrence. The review lists webbing, a thin band of skin that bridges the inner corner, as a risk factor for the fold coming back. One surgeon's series of 116 patients reports a single patient needing a revision for a residual web. The meta-analysis found no significant difference in complications overall between the two methods compared, but its authors caution that the follow-up was short.

Asymmetry between the two corners is the other risk to know about, and the reason a surgeon records both sides before starting. If a second opinion would help you weigh these, the article on second opinions explains what that visit is for.

What makes an inner corner look natural, and how long does the scar take to settle?

A natural result is a judgement about the whole face, not a measurement. Inner corner, crease, brow, nose bridge and the spacing between the eyes all work together, and opening one corner changes how the others read.

That is why more is not better, and why a plan that corrects part of the fold and stops deserves serious consideration. The tradeoff that follows from the papers is this: a small change with a short, well-hidden scar, against a larger change that risks an exposed caruncle.

On timing, the papers cited here give no fixed time for the scar to mature. The meta-analysis scored scars at six months, and said follow-up of one to six months was too short to judge long-term maturation. The 116-patient report began silicone gel at about two weeks and used injections into the scar if it thickened. Both point the same way: judge the corner after the swelling has gone and the scar has softened, which, going by studies that score scars at six months, means months and not weeks. The week-by-week picture for the lid is in my page on upper blepharoplasty recovery. For choosing who operates, see my guide to choosing an eyelid surgeon.

When is an inner corner difference a medical condition?

When it comes with a droopy lid, a short eye opening and wide-set inner corners from birth. That pattern is blepharophimosis syndrome, a childhood condition for a specialist team, and the surgery is functional, not cosmetic.

A 2026 review describes blepharophimosis-ptosis-epicanthus inversus syndrome as four features: telecanthus, wide-set inner corners; ptosis, a drooping upper lid; epicanthus inversus; and a reduced horizontal eye opening, 20 to 22 mm against 25 to 30 mm in adults. It is linked to variants in the FOXL2 gene, and one type can also involve premature ovarian failure, so the child is cared for beyond the eyelids. The authors describe most operations as done before age 5, in two stages, with the epicanthus and telecanthus corrected first and ptosis 6 to 12 months later. A child with a droopy lid is covered in my article on childhood ptosis, and the cosmetic questions in this article do not apply.

Any new change at the inner corner in an adult, such as swelling, a lump, a sore or a lid that is turning, is a separate matter and needs an examination. More on the area is in the eyelid conditions section and my hub article on why eyes look tired.