Xanthelasma: the yellow patches on the eyelid, and what they can say about the rest of you

The consultation usually opens the same way. A woman points at the inner corner of her upper lid, says she has had these yellow patches for a year or two, and asks how quickly they can be taken off. Nothing about that request is unreasonable. I do want one conversation first, because xanthelasma is the rare eyelid finding that is also a message about the rest of the body, and once the patch is gone, the message goes with it.

So this piece answers both halves. What the yellow patches are and how they are removed, and what a sensible person should do with the information they carry.

What are the yellow patches on my eyelids?

They are cholesterol. Xanthelasma palpebrarum is a soft, lipid-rich deposit, particularly of cholesterol, appearing as semisolid yellowish papules or plaques on the eyelid. A xanthoma, the wider family it belongs to, is a skin lesion caused by the accumulation of fat in macrophages in the skin, and macrophages are the scavenging cells that clear debris from tissue. Xanthelasma is the commonest form of xanthoma.

It has a favourite address. The lesion usually sits around the medial canthus, the inner corner where the upper and lower lids meet next to the nose, most often on the upper lid, and the upper and lower lids can be affected symmetrically. It starts as a small bump and enlarges slowly over several months. It is soft, yellow or yellow-orange, flat or slightly raised, and it does not hurt.

That last detail matters, because plenty of things appear on an eyelid and only some of them are harmless. A firm lump behind the lash line behaves differently and is usually a blocked oil gland, which I have set out in my guide to chalazion, stye or something else. A lesion that bleeds, crusts or takes lashes with it belongs in another category again, and the warning signs of eyelid skin cancer are the ones I want any adult to recognise. Colour alone diagnoses nothing.

Does this mean my cholesterol is high?

Sometimes, and not always, and both halves of that sentence are true at once. Approximately 50 per cent of adults with xanthelasma have abnormal lipid levels. At the same time, DermNet is explicit that it will often occur with normal levels of circulating lipids. One hospital series of 80 patients with xanthelasma found dyslipidaemia in 80 per cent of them, which is worth knowing as one series with its own population rather than as the number.

Xanthelasma is also associated with familial hypercholesterolaemia and type II hyperlipoproteinaemia, with primary biliary cirrhosis, and with diabetes and thyroid dysfunction. None of that means a patch on your lid diagnoses any of them. It means the patch has earned a blood test, which is a very ordinary way to answer a question that is otherwise invisible.

Which blood tests are worth having?

A serum lipid profile first, then a liver panel, thyroid function tests and a fasting blood glucose where they are warranted, with a twelve-hour fast before collection so the lipid numbers mean what they say. That is the list in both the ophthalmic and the dermatological sources, and it is the list I write down for patients.

The reason to bother is unglamorous. High cholesterol does not usually cause symptoms, and you can only find out you have it from a blood test. Nothing about it announces itself in the mirror, with one exception, and you are currently looking at that exception every morning while you put your face on. Anything you then decide to do about a result belongs to your own doctor, not to an eye surgeon, and certainly not to an article.

My cholesterol is normal. Does the patch still matter?

Yes, and this is the part most people have never been told. In the Copenhagen City Heart Study, 12,745 people were followed for up to 33 years. Compared with people without xanthelasmata, those with them had multifactorially adjusted hazard ratios of 1.48 (95% CI 1.23 to 1.79) for myocardial infarction, 1.39 (1.20 to 1.60) for ischaemic heart disease, 1.69 (1.03 to 2.79) for severe atherosclerosis and 1.14 (1.04 to 1.26) for death. Ischaemic stroke was not significant at 0.94 (0.73 to 1.21), and arcus corneae, the pale ring some people develop around the cornea, was not an important independent predictor after adjustment.

The authors concluded that xanthelasmata predict increased risk of myocardial infarction, ischaemic heart disease and total death independently of well known cardiovascular risk factors, including plasma cholesterol and triglyceride concentrations. Read that last clause slowly. The signal did not disappear when they accounted for the cholesterol result.

None of this is a reason to be frightened by your own eyelid. It is a reason to take the finding to a doctor who looks after the rest of you, have the tests, and have the conversation about risk factors while it is a conversation rather than an event.

Why will no cream shift it?

Because there is nothing on the surface to dissolve. The deposit is fat that has accumulated inside macrophages within the skin, so any product applied on top is being asked to reach through intact tissue and remove material from inside cells. Look at what actually works and the pattern is obvious: every listed treatment removes or destroys tissue.

The options group by depth. Superficial lesions are treated with fractionated erbium:YAG or carbon dioxide laser, both of which ablate, meaning they vaporise a controlled layer of tissue. Lesions of roughly 100 to 1000 micrometres are treated with topical trichloroacetic acid, a chemical that destroys the tissue it is applied to. Lesions deeper than 1 mm are treated with surgical excision, sometimes as part of a blepharoplasty where there is excess skin to account for as well, which is the same anatomy I describe in my guide to upper eyelid surgery. Cryotherapy, electrodessication and radiofrequency also appear in the literature.

Two figures belong in the decision, and I give them before anyone books anything. Recurrence is generally less than 50 per cent, and around 60 per cent after retreatment, and lesions deeper than 1 mm recur considerably more often. That is not a reason to leave it. It is a reason to know what you are agreeing to, and to ask about recurrence before anything is booked, because it belongs in that conversation.

Why is a pigment laser the wrong tool for it?

Because the laser is looking for something that is not there. Lasers of that kind work by selective photothermolysis: the wavelength is chosen so that it is absorbed strongly by one target structure, called a chromophore, and much less by the tissue around it, which is what makes the treatment selective in the first place. The skin chromophores such a laser targets are melanin, oxyhaemoglobin and tattoo pigment.

Xanthelasma contains none of them. It is a cholesterol-rich deposit inside macrophages, not melanin in a pigment cell and not haemoglobin in a vessel. Which is exactly why the lasers named for xanthelasma in the literature are the ablative ones, erbium:YAG and carbon dioxide, that remove tissue rather than heat a coloured target inside it. The word laser covers two completely different jobs, and the yellow you can see is not the yellow a pigment device is built to find.

That distinction belongs to the skin clinic as much as to the eye clinic, and Dr Ong Jin Khang has written the other half of it from the aesthetic side, on why a lipid plaque is not a pigment target and what a doctor there should do instead when a patient arrives asking for a laser. If you want the eye side of the surrounding anatomy, the shadows, hollows and lid changes that make people book a consultation in the first place, I have written about what actually makes eyes look tired, and the wider set of eyelid conditions I treat sits alongside it.

My own order of business, then. Identify the lesion properly, because the eyelid does not reward assumptions. Do the blood tests, because a visible marker is worth using while it is on display. Then, and only then, discuss taking it off, with the recurrence figures on the table and no promises attached.