The Biology In Plain English: From Cholesterol In Your Blood To A Yellow Plaque On Your Eyelid, Why The Eyelids Are Chosen, Why It Forms Even With Normal Cholesterol, And What That Means For Removal
Xanthelasma forms when cholesterol-carrying particles leak out of tiny blood vessels in the eyelid, immune cells called macrophages swallow them, and the cells become fat-filled “foam cells” that gather into a soft yellow plaque. It happens slowly, over months and years. Because the fat ends up locked inside cells in the deeper skin, the plaque doesn’t drain away or shrink when cholesterol falls, which is why removal is what clears it.
Blinking squeezes the eyelid’s tiny blood vessels, which grow leakier with age. Cholesterol-carrying particles seep into the skin, macrophages swallow them and turn into foam cells, and the foam cells cluster around the vessels into a yellow plaque. About half of people have a lipid disorder feeding this; the rest have normal blood fats.
Key Takeaways
- Xanthelasma is made of foam cells: immune cells packed with cholesterol.
- They gather around small vessels in the deeper layer of the eyelid skin.
- Blinking and leaky vessels help explain why the eyelids are chosen.
- About half of people with xanthelasma have a lipid disorder.
- It can form with normal cholesterol, often alongside low HDL.
- Lowering cholesterol rarely shrinks a plaque once it has formed.
On This Page 16 sections
How Does Xanthelasma Form?
Cholesterol-carrying particles leak from tiny eyelid blood vessels into the skin, where immune cells called macrophages swallow them and become foam cells. Over time, enough foam cells gather to make a visible yellow plaque.
StatPearls, the National Library of Medicine’s clinical reference, describes this as the leading explanation: the eyelid’s capillaries are compressed with every blink, they become more permeable with age, and lipid-laden macrophages build up around them in the dermis with some inflammation.[1] Xanthelasma isn’t a growth that pushes out of the skin like a wart; it’s a slow accumulation of cells that are already there.
Our pages on what xanthelasma is and how xanthelasma starts cover the basics and the first visible signs. This page is the biology behind them.
What Is Xanthelasma Made Of?
Foam cells: macrophages, also called histiocytes, that have swallowed so much cholesterol they look foamy under the microscope. They cluster around small blood vessels in the superficial reticular dermis, the tougher layer beneath the skin’s surface.
That’s what a doctor sees when a sample is examined, according to StatPearls.[1] The cholesterol stored inside these cells gives the plaque its yellow color, and the cells sitting fairly close to the surface explain why the plaques are soft and why the color shows through so clearly on thin eyelid skin.
A biopsy isn’t usually needed; doctors recognize xanthelasma on sight and only take a sample if the diagnosis is uncertain.[1] Our page on xanthelasma palpebrarum, its medical name, explains more about what’s under the microscope.
What Are The Steps In How Xanthelasma Forms?
Six steps, from blood to plaque: supply, squeeze, leak, swallow, gather and show. Each takes time, which is why plaques build up over months and years.
- Supply. Cholesterol travels in the blood inside particles such as LDL; more of them means more raw material.
- Squeeze. Every blink compresses the eyelid’s tiny capillaries.[1]
- Leak. With age the vessels grow leakier, and fat-carrying particles seep into the skin.[1]
- Swallow. Macrophages, the skin’s clean-up cells, take in the fat and become foam cells.[1]
- Gather. Foam cells collect around the vessels in the deeper skin, with some inflammation.[1]
- Show. Once enough have built up, a soft, flat, pale yellow patch appears on the surface.
The cycle doesn’t stop on its own. As long as particles keep leaking and cells keep swallowing them, a plaque can widen, thicken or be joined by new spots. Our page on whether xanthelasma can get bigger looks at what happens next.
Why Does Xanthelasma Form On The Eyelids?
Most likely because of constant movement and thin skin. Blinking repeatedly squeezes the lid’s tiny vessels, and eyelid skin is so thin that even a small build-up of yellow cells shows through.
StatPearls points to the mechanical stress of blinking on eyelid capillaries as part of the explanation.[1] The inner corners of the upper lids are the classic site, and plaques often appear on both eyes and sometimes on the lower lids too.[1]
Other xanthomas form in other places for similar reasons: tendon xanthomas in tendons under constant strain, tuberous ones over pressure points like elbows and knees. Our pages on what causes cholesterol deposits around the eyes and the wider xanthoma family explain the pattern.
What Role Does Cholesterol Play In How Xanthelasma Forms?
Cholesterol is the raw material. Higher LDL and apolipoprotein B mean more particles to leak into the skin, and lower HDL, the cholesterol that helps clear fat away, tips the balance toward build-up.
A 2020 review of 15 studies with 854 patients found people with xanthelasma had higher total cholesterol, LDL and apolipoprotein B, and lower apolipoprotein A1, than people without it.[3] Apolipoprotein B sits on the particles that carry cholesterol into tissues; apolipoprotein A1 is the main protein of HDL.
StatPearls lists the lipid disorders most often found: high LDL (type IIa), high cholesterol and triglycerides together (type IIb), high triglycerides (type IV) and low HDL.[1] Our page on whether xanthelasma indicates raised cholesterol explains how to read your results.
How Can Xanthelasma Form With Normal Cholesterol?
Through local and individual factors. Many people with normal total cholesterol still have low HDL, and differences in the eyelid’s vessels, hormones and macrophages seem to make some people form plaques anyway.
In a clinic study of 42 people with xanthelasma, 54.8% had normal total cholesterol, but median HDL was 36.2 mg/dL compared with 50.5 mg/dL in people without xanthelasma.[2] The authors suggested local, hormonal or macrophage factors also play a part.[2]
So a normal cholesterol result doesn’t mean your plaques formed “for no reason”, and it doesn’t rule out other heart risk factors. Our page on why you’ve got xanthelasma helps you work out which group you’re in.
What Makes Some People Form Xanthelasma?
A primary lipid disorder, a condition or medicine that raises blood fats, an inherited tendency, or a combination. About half of people with xanthelasma have one of these; the rest have normal lipids.
Primary Lipid Disorders
- High LDL cholesterol
- High cholesterol and triglycerides
- High triglycerides
- Low HDL
Secondary Causes
- Primary biliary cholangitis
- Diabetes and an underactive thyroid
- Nephrotic syndrome
- Retinoid or estrogen medicines
That’s the StatPearls classification, which also notes an inherited lipid disorder should be considered in young people.[1] Familial hypercholesterolemia, affecting about 1 in 250 to 1 in 500 people, keeps LDL high from birth and can bring xanthelasma and tendon lumps early.[4] Our guides to the causes of xanthelasma and whether xanthelasma is genetic go through each one.
Who Is Most Likely To Form Xanthelasma?
Women more than men, mostly in middle age. StatPearls puts it at about 1.1% of women and 0.3% of men, seen from about age 20 to 70 and most often between 35 and 55.
Those figures come from StatPearls.[1] In the clinic study, 85.7% of patients were women and the average age was about 47.[2] Age fits the formation story: blood vessels become leakier over time, giving cholesterol more chances to escape into the skin.[1]
Plaques appearing in your twenties or early thirties are less typical and worth a prompt cholesterol check, especially if there’s early heart disease in the family.
How Long Does Xanthelasma Take To Form?
Months to years. By the time you notice a faint yellow spot, the build-up beneath the skin has usually been going on for some time, and it tends to keep progressing slowly afterward.
StatPearls describes the plaques as tending to stay the same or slowly progress, and rarely resolving by themselves.[1] No study has measured how many months it takes from the first foam cells to a visible plaque, and the pace varies from person to person.
A yellow spot that seems to appear overnight or changes within days is unlikely to be xanthelasma and should be checked. Our pages on how fast xanthelasma grows and what xanthelasma looks like explain the typical pattern.
Does Xanthelasma Form The Same Way As Artery Plaque?
There are clear parallels: both involve cholesterol-carrying particles entering tissue and macrophages turning into foam cells. That shared biology is part of why xanthelasma is linked with heart disease.
In the Copenhagen City Heart Study of almost 13,000 people followed for decades, xanthelasma was linked with a higher risk of heart attack and ischemic heart disease, even after allowing for cholesterol and other known risk factors.[5] The 2020 review also found thicker carotid artery walls and a higher risk of atherosclerosis in people with xanthelasma.[3]
The plaques on your eyelids don’t damage your heart, but they can be a visible reminder of what may be happening elsewhere. Our page on whether xanthelasma is dangerous explains the risk.
How Xanthelasma Forms: The Stages At A Glance
| Stage | What Happens | What You See |
|---|---|---|
| Supply | Cholesterol-carrying particles circulate in the blood | Nothing |
| Leak | Blinking and age make eyelid vessels leakier | Nothing |
| Swallow | Macrophages take in fat and become foam cells | Nothing yet |
| Gather | Foam cells cluster around vessels in the deeper skin | A faint pale yellow mark |
| Plaque | Enough foam cells build a stable deposit | A soft yellow plaque with clear edges |
| Progress | More cells collect; neighboring spots form | Wider, thicker or joined plaques |
What Does The Way Xanthelasma Forms Mean For Removal?
Because the fat is locked inside living cells in the deeper skin, it can’t be squeezed out, scrubbed off or dissolved by lowering cholesterol. The plaque has to be removed so new skin can grow in its place.
- Lowering cholesterol cuts the supply of new material but may do little for plaques already formed.[1]
- Squeezing doesn’t work: there’s no core, only cells woven into the skin.
- Removal clears the plaque: a 2023 review found CO2 laser gave more than 75% improvement in over 90% of patients, with surgery for larger, deeper plaques.[6]
- Recurrence happens in generally fewer than half of cases, because the conditions that formed the plaque may still be there.[1]
Our pages on whether you can squeeze out xanthelasma, whether xanthelasma can be reversed and how to remove xanthelasma go further.
If your doctor has checked the cause and you’d like to clear small to medium plaques at home, this is the cream we make for it. Our xanthelasma removal cream guide explains how it compares.
Can You Stop Xanthelasma From Forming?
You can lower the odds by managing the supply side: get your blood fats tested and manage any lipid, thyroid, blood sugar or liver problem. Local factors in the eyelid mean no plan can promise new plaques won’t form.
- Get a fasting lipid profile, liver, thyroid and glucose tests.[1]
- Eat less saturated fat and more fiber, stay active and don’t smoke.
- Take cholesterol-lowering medicine if your doctor advises it.
- Ask about retinoid or estrogen medicines if you take them.
- Photograph your eyelids every few months to catch new spots early.
Our page on how to prevent xanthelasma sets out a fuller plan.
When Should You See A Doctor About Xanthelasma Forming?
Once when you first notice it, for the diagnosis and blood tests. Go promptly if you’re young, have lumps on your tendons, a family history of early heart disease, or a spot that’s firm, bleeding or changing fast.
Young age and tendon lumps point toward an inherited lipid disorder such as familial hypercholesterolemia, where early statin care makes a real difference.[4] Bring a list of your medicines, since retinoids and estrogens are recognized secondary causes.[1] Once the check is done and any cause is in hand, you don’t need ongoing care for the plaques themselves.
What’s The Bottom Line On How Xanthelasma Forms?
Xanthelasma forms when cholesterol-carrying particles leak from eyelid blood vessels, macrophages swallow them and become foam cells, and the foam cells gather into a yellow plaque in the deeper skin. Blinking and thin skin help explain why the eyelids are chosen. About half of people have a lipid disorder feeding the process; the rest have normal lipids, often with low HDL. Because the fat is locked inside cells, plaques rarely shrink on their own, so removal is what clears them.
Xanthel® is a cosmetic cream made for xanthelasma removal at home, sold by Xanthelasma.com. You’ll find it in the removal section above and at the foot of this page, or read more about Xanthel® for removing xanthelasma once it has formed. For everything else, browse all our xanthelasma guides.
Common Questions About How Xanthelasma Forms
How Does Xanthelasma Form On The Eyelids?
Cholesterol-carrying particles leak from tiny eyelid vessels, immune cells swallow them and become foam cells, and the foam cells gather into a yellow plaque.
What Are Foam Cells In Xanthelasma?
Macrophages, the skin’s clean-up cells, that have swallowed so much cholesterol they look foamy under the microscope.
Why Does Xanthelasma Form On The Eyelids Specifically?
Blinking squeezes the lid’s tiny vessels, which grow leakier with age, and eyelid skin is thin enough for the yellow to show.
Does High Cholesterol Cause Xanthelasma To Form?
It’s a common contributor, but not a requirement; about half of people with xanthelasma have normal blood fats.
Can Xanthelasma Form With Normal Cholesterol?
Yes, often alongside low HDL, with local, hormonal or immune-cell factors in the eyelid also playing a part.
How Long Does Xanthelasma Take To Form?
Months to years; the build-up starts beneath the skin well before a spot becomes visible.
Why Doesn’t Xanthelasma Go Away When Cholesterol Falls?
Because the fat is locked inside living cells in the deeper skin, which the body doesn’t clear away.
Can I Stop Xanthelasma From Forming Again?
Managing any lipid or other cause lowers the odds, but recurrence after removal still happens in generally fewer than half of cases.
Sources
- Blair K. Xanthelasma Palpebrarum. StatPearls, National Library of Medicine (NCBI Bookshelf), updated 2026.
- Kavoussi H, Ebrahimi A, Rezaei M, Ramezani M, Najafi B, Kavoussi R. Serum lipid profile and clinical characteristics of patients with xanthelasma palpebrarum. Anais Brasileiros de Dermatologia, 2016;91(4):468-471.
- Chang HC, Sung CW, Lin MH. Serum lipids and risk of atherosclerosis in xanthelasma palpebrarum: a systematic review and meta-analysis. Journal of the American Academy of Dermatology, 2020;82(3):596-605.
- Ison HE, Clarke SL, Knowles JW. Familial Hypercholesterolemia. GeneReviews, National Library of Medicine (NCBI Bookshelf), revised 2025.
- Christoffersen M, Frikke-Schmidt R, Schnohr P, Jensen GB, Nordestgaard BG, Tybjaerg-Hansen A. Xanthelasmata, arcus corneae, and ischaemic vascular disease and death in general population: prospective cohort study. BMJ, 2011.
- Malekzadeh H, Ormseth B, Janis JE. A Practical Review of the Management of Xanthelasma Palpebrarum. Plastic and Reconstructive Surgery Global Open, 2023;11(5):e4982.
