Babies & first checks

There's a hard lump at my child's eyebrow, what is it?

You have found a small firm bump at the outer edge of your child's eyebrow and your mind has already gone somewhere frightening. Here is what it usually is, why it is not what you fear, and what happens next.

by Dr Chan Li Yen · MBBS, MOphth (UM), Fellowship in Paediatric Ophthalmology & Strabismus

Practises at Hospital Kuala Lumpur 12 min read · 2,092 words

Key takeaways

The commonest firm lump at the outer end of a young child's eyebrow is a dermoid cyst, ordinary skin, hair and fat trapped where two bones of the eye socket meet.
A dermoid cyst is not cancer. It is an overgrowth of normal tissue sitting in the wrong place.
Removal is often advised because a cyst that ruptures can cause inflammation around the eye, not because of what the lump might turn into.
A lump is diagnosed in clinic by examination, and sometimes a scan is needed first, not from a description or a photograph.
A dermoid on the surface of the eye itself is a different condition and can affect focus, so any lump touching the eye needs its own look.

You were doing something ordinary, drying your child after a bath, brushing their hair back from their face, and your thumb caught on something that should not be there. A small firm bump, right at the outer end of the eyebrow, near the ear side. It does not seem to hurt them. It has probably been there longer than you realised. And your mind, like every parent's mind at that moment, has already jumped somewhere frightening.

I want to answer the question you actually came here to ask before anything else. In a young child, a firm, painless lump in that exact spot, the outer corner of the eyebrow, is almost always a dermoid cyst. It is not cancer. Let me explain what it is, why it forms, and why I still often recommend taking it out.

What is this lump at my child's eyebrow?

It is most likely a dermoid cyst: a small pocket of ordinary skin, hair and fat, sitting where it should not be. During early development, the bones of the eye socket grow together and join at seams, rather like plates coming together to form a bowl. Occasionally a bit of skin tissue gets caught at one of those seams as it closes, and it keeps behaving exactly as skin behaves everywhere else on the body: it forms a lining, it sheds cells slowly into a pocket, and over months and years that pocket grows.

The outer end of the eyebrow, closest to the ear, is by far the commonest place to find one, because that is exactly where two of those bony seams meet. It is usually round or oval, firm rather than hard, and it moves a little under your finger because it is not fixed to the skin above it. Most are painless. Most have been there since birth, simply too small to notice until a growth spurt, or a bath, or a photograph brings it to your attention.

Is a lump near my child's eye cancer?

No. A dermoid cyst is an overgrowth of completely normal tissue that has ended up in the wrong location. It is not an abnormal growth of anything, and it does not turn into cancer. I say this early and plainly because I know exactly what word crossed your mind in the bathroom, and I would rather answer it here, on the first page you read, than leave you carrying it through a wait for an appointment.

That reassurance comes with an honest limit. What I have just described is the typical picture, and it is the overwhelmingly likely one for a firm, mobile, painless lump at the outer eyebrow of a young child. But a lump is diagnosed by examining it, not by reading a description of it, however accurate that description is. If anything about your child's lump does not fit this pattern, tenderness, rapid growth, redness, or a change anywhere in the eye itself, that is a different conversation, and it belongs in a clinic rather than on a page.

If it isn't cancer, why does it need to come out?

Because of what can happen if it opens up, not because of what it might become. A dermoid cyst that ruptures, whether from a knock, an infection, or simply age, can spill its contents and cause inflammation around the eye. That inflammation is unpleasant to treat and considerably more disruptive for your child than a planned, unhurried removal of a small, intact cyst. This is the actual reasoning your ophthalmologist is using when removal is suggested. It has nothing to do with malignancy.

That said, removal is a recommendation to discuss, not an automatic next step for every lump the moment it is found. Your child's ophthalmologist will weigh the size, the exact position, and how settled the cyst looks on examination before advising you.

A dermoid cyst is trapped normal tissue, not abnormal tissue, and it is not cancer.

How is a dermoid cyst actually diagnosed?

By an examination, and sometimes by a scan first. In clinic, I feel the lump, note whether it moves freely or feels tethered to the bone beneath it, and check the eye itself for anything the lump might be affecting. The story matters too: how long it has been there, whether it has changed suddenly or grown slowly, and whether your child has ever complained of it.

For some children, particularly if a cyst sits deeper or the edges are not fully clear on examination, an imaging scan is used before any decision about surgery, to map exactly where the cyst sits in relation to the bone. This is a considered, deliberate step, not a sign that something worse is suspected. It is worth knowing this in advance, because the same examination approach we use here is the one described in how we test a young child's eyes more generally: careful looking and gentle handling, with almost nothing asked of your child beyond sitting still for a minute.

What does removing a dermoid cyst involve?

A small operation, usually done as day surgery. A cut is made in the skin over the cyst, positioned to sit within a natural skin crease where possible, and the cyst is carefully separated from the surrounding tissue and the bone it sits against, then removed in one piece if it can be. The wound is closed and your child goes home the same day in almost every case.

What happens afterwards matters as much as the operation itself: the removed tissue is always sent to a pathologist, who examines it under the microscope. That step confirms what we already believed the lump to be from the examination. It is a routine part of any lump removal, not a sign of doubt about the diagnosis.

Will the lump keep growing, and when should I worry?

Left alone, most dermoid cysts do keep growing, slowly, over months and years, rather than staying a fixed size. That slow, steady pattern is itself reassuring, and it is one reason many are removed while still small, when the operation is more straightforward. Occasionally one is simply left, and is still there, a little larger, when its owner is grown up: what it involves to have a longstanding dermoid cyst removed in adulthood is written by Dr Catherine Chow, who takes on exactly that operation once the patient is no longer mine to look after.

What should change your timeline is a change in the pattern, not the presence of the lump itself. See a doctor sooner, rather than waiting for a routine slot, if the lump becomes red, tender or suddenly larger, if it feels fixed to the bone rather than mobile, if it is growing quickly rather than slowly, or if you notice any change in the eye itself, its appearance, its movement, or how your child seems to be seeing. None of these findings mean the worst. They mean the lump has stopped behaving in the ordinary way, and an ordinary lump deserves an ordinary look sooner rather than later.

Could this lump be something else instead?

It is worth ruling out the near neighbours before you settle on dermoid cyst in your own mind. A dermoid cyst sits beside the eyebrow, on the bone, and is painless and mobile from the start. A lump on the eyelid margin itself that came on quickly and looks tender is more likely to be a stye, and styes in children follow a different course and usually settle on their own or with simple treatment. A dermoid that sits directly on the surface of the eye, rather than beside it at the eyebrow, is a separate condition again, and because it can affect focus, including astigmatism or a lazy eye if it grows large, any lump touching the eye itself needs its own assessment rather than being lumped in with the eyebrow type.

If you are ever unsure which pattern you are looking at, that uncertainty is itself the reason to book a visit rather than keep watching and waiting. A short examination will usually settle it within minutes, and if a scan is needed to be certain, that is arranged from there. Parents sometimes worry that seeking an early opinion on something so small is making a fuss over nothing, and I would rather you made that trip and heard good news than sat at home rehearsing the worst one on your own. If your child's eye examinations so far have all been the ordinary run of a baby's first eye checks, a new lump is simply the next thing worth a look, not a reason to be alarmed.

See a doctor sooner if…

The lump becomes red, tender or suddenly larger over days.
The lump feels fixed to the bone or is growing quickly rather than slowly.
There is any change in the eye itself: redness, discharge, or the eyelid swelling shut.
You notice any change in how your child sees, or their eyes stop tracking normally.
The lump sits on the surface of the eye rather than beside the eyebrow.

Common questions

There is a hard lump by my baby's eyebrow, what is it?

In a young child, a firm, painless, slow-growing lump at the outer end of the eyebrow is most often a dermoid cyst. It forms where two bones of the eye socket join during development, and it is made of ordinary skin, hair and fat that got trapped in the wrong place rather than anything abnormal growing. It is diagnosed by examination in clinic, and sometimes a scan is used to confirm exactly where it sits before any decision is made.

Is a lump near the eye cancer?

A dermoid cyst is explicitly not cancer. It is an overgrowth of normal tissue in an abnormal location, not an abnormal growth of anything. I understand why the word crosses a parent's mind the moment a lump appears, and I would rather say this plainly on the first page you read than have you carry the worry any longer than you need to.

Does a dermoid cyst have to be removed?

Removal is often recommended, though the decision belongs to you and your child's ophthalmologist after an examination. The reason is not what the lump might become. It is the risk that the cyst can open up and cause inflammation around the eye, which is more difficult to settle than a planned removal. The tissue removed is always sent to the laboratory to confirm exactly what it was.

Will it get bigger?

Usually, yes, slowly. A dermoid cyst tends to enlarge gradually over months or years rather than staying a fixed size, which is one reason many are removed while they are still small and straightforward. A lump that grows quickly, rather than slowly, or that changes suddenly, is different and should be seen sooner rather than at a routine visit.

What does the surgery involve?

A small cut is made in the skin over the cyst, the cyst is carefully loosened from the surrounding tissue and bone, and it is removed as a whole where possible. The tissue then goes to a pathologist, who examines it under the microscope to confirm the diagnosis. Your child's ophthalmologist can talk you through what to expect on the day itself.

Could this lump affect my child's vision?

A dermoid beside the eyebrow, the common orbital type, does not usually affect vision in the eye underneath it. A dermoid that sits on the surface of the eye itself is a different type of lump entirely, and because it can affect focus, including causing astigmatism or a lazy eye if it is large, any lump that touches the eye rather than the eyebrow needs an assessment of its own.

How do I know it isn't a stye or an insect bite instead?

A stye sits on the eyelid margin itself, comes on over a day or two, and is usually tender and red from the start, quite unlike the firm, painless, slow-growing lump at the eyebrow that points to a dermoid cyst. If you are unsure which pattern you are looking at, <a href="/journal/styes-in-children/">a stye behaves differently and settles differently</a>, and an examination will tell the two apart quickly.

References

AAPOS · Dermoid cyst · aapos.org
Moorfields Eye Hospital · Preseptal and orbital cellulitis, children's eye conditions management · www.moorfields.nhs.uk
NHS Alder Hey Children's Hospital · Care of a child with orbital cellulitis · www.alderhey.nhs.uk
NHS · Eyelid problems · www.nhs.uk

By Dr Chan Li Yen. General information only. It does not replace a consultation. If you are worried about your child's eyes or vision, please see an eye doctor.