Enlarged Gland · Benign · CityLink Mall

Sebaceous Hyperplasia —
A Gland, Not a Blockage

The soft yellowish bump with a dip in the centre is not a blocked pore and not a whitehead that never came to a head. It is an enlarged sebaceous gland, and there is nothing inside it to extract — which is why squeezing it produces nothing but inflammation and, in Asian skin, a brown mark.

The Mechanism

The Gland Outgrows Its Duct

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A sebaceous gland is a normal structure attached to every hair follicle, producing the sebum that keeps skin and hair pliable. In sebaceous hyperplasia that gland enlarges — not by filling with retained oil, but by acquiring additional lobules, each a functioning unit of sebum-producing cells. These lobules crowd around the central duct, which dilates under the load. What you see at the surface is the shape of that arrangement: a soft papule, yellow or flesh-toned, with a small central depression marking the duct. The dip is the signature.

This structure is why the standard responses fail. Nothing is trapped inside, so extraction has nothing to extract. Squeezing compresses a mass of living glandular tissue against the dermis, which inflames it — and in Fitzpatrick III to V skin inflammation means post-inflammatory hyperpigmentation, so the manoeuvre replaces a flesh-coloured bump with a brown mark that lasts far longer. Exfoliating acids thin the stratum corneum above the lesion and leave the gland beneath untouched. The lesion sits deeper than anything a topical routine reaches.

Androgens govern sebaceous gland activity, which explains both the distribution and the demographics. The lesions cluster where glands are largest and densest — forehead, temples, nose, medial cheeks — and become commoner with age as gland turnover slows and individual glands enlarge. Oily skin types are more prone. They are also well recognised in patients on long-term ciclosporin, and multiple lesions appearing suddenly in someone on immunosuppressive therapy is worth mentioning at consultation.

They are benign and they carry no risk of malignant change. The clinical problem is one of resemblance rather than behaviour: an early basal cell carcinoma can present as a small, pearly, slightly translucent papule on exactly the same part of the face, and the two are not always separable on a casual look. A lesion that is enlarging steadily, has developed visible fine vessels across its surface, has bled without being traumatised, or has ulcerated in the centre is assessed before anything is done to it.

Feature One
The Central Dip
A small umbilication at the centre, marking the dilated duct that the enlarged lobules surround. Under good light and slight stretch it is usually visible, and it is the most useful single feature separating this from a comedone or a milium.
Feature Two
Soft And Yellowish
Compressible rather than firm, and often faintly yellow because of the lipid content of the glandular tissue. A milium by contrast is hard, white and mobile; a sebaceous hyperplasia does not move independently of the skin.
Feature Three
Nothing Comes Out
There is no core, no plug and no retained oil. Patients usually discover this by trying. What follows the attempt is inflammation, a lesion that looks worse for a fortnight, and frequently a pigmented mark where it stood.
Feature Four
It Persists
Unlike a spot, it does not come to a head, does not resolve over a week, and does not respond to acne treatment. A stable flesh or yellow papule that has been in the same place for months is behaving like a structure, not like a lesion.

The Distinction

Three Bumps Compared

Small facial bumps are routinely lumped together and treated as though they were all acne, which suits none of them. These three are distinguished by what they are made of, and the difference determines whether extraction, incision or ablation is the appropriate answer.

There is nothing inside a sebaceous hyperplasia to squeeze out. All the squeezing achieves is a brown mark where a flesh-coloured bump used to be.

Dr. Sin Yong · Medical Director, Atelier Aesthetics

Specifications

Nature
Benign enlargement of a sebaceous gland — additional lobules, not retained oil
Key Sign
Soft yellowish papule with a central umbilication
Sites
Forehead, temples, nose and medial cheeks — highest gland density
Before Removal
Basal cell carcinoma excluded; assessed, not assumed
Type I
Sebaceous Hyperplasia
Enlarged glandular tissue with a central duct. Soft, yellowish, umbilicated, persistent. Nothing to extract. Reduced by controlled ablation of the glandular bulk, never by pressure or by acne therapy.
Type II
Milium
A tiny keratin cyst trapped beneath the surface of the epidermis. Hard, white, dome-shaped, with no central dip. It is removed by a fine incision and expression of the keratin pearl — a genuinely different procedure with a genuinely different target.
Type III
Closed Comedone
A follicle obstructed by keratin and sebum — a true acne lesion, part of the same process that produces papules and pustules. It responds to comedolytic therapy and belongs to an acne plan, which neither of the other two does.

Management

Reduction, Not Extraction

Treatment means reducing the glandular bulk, and it is done with controlled thermal or electrosurgical destruction aimed at the lesion rather than the skin around it. Enough energy to flatten the papule, and no more — because the gland sits in the dermis, and a removal deep enough to guarantee it never returns is also deep enough to leave a small depressed scar. On a forehead carrying a number of these, a shallow scar in each place is a considerably worse outcome than the bumps were.

The realistic account is therefore that treatment flattens the lesion and improves the surface, and that a proportion of lesions recur over the following years because residual glandular tissue was deliberately left behind. This is a considered trade-off rather than an incomplete job. Treating in stages, reviewing how the skin healed before going further, and accepting a lesion that is much less visible rather than chasing one that is entirely gone all produce better faces over a decade.

Two caveats carry real weight in this population. The first is diagnostic: basal cell carcinoma can mimic these lesions closely, so anything that has grown, bled, ulcerated or developed surface vessels is assessed properly before it is ablated. The second is pigmentary: in Asian skin, every thermal injury risks post-inflammatory pigment change, which means conservative energy, meticulous aftercare and strict photoprotection during healing. Where oily skin and visible pores form part of the wider complaint, the texture and pore question is addressed separately, and where inflammatory lesions coexist, acne is treated on its own terms.

If the bumps are hard and white

FAQ

Sebaceous Hyperplasia — Common Questions

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Because there is nothing in it to come out. The lesion is solid glandular tissue — additional sebaceous lobules around a dilated duct — not a pocket of trapped oil or keratin. Pressure compresses living tissue and inflames it, leaving a bump that looks worse for a fortnight and, in Fitzpatrick III to V skin, frequently a brown mark that outlasts the original lesion by months.
No. The lesion is entirely benign and does not turn malignant. The clinical caution is about resemblance rather than transformation: early basal cell carcinoma can look very similar — a small pearly papule on the same areas of the face — so a lesion that is enlarging, has developed fine surface vessels, has bled without trauma or has ulcerated centrally is assessed before any destructive treatment.
Some lesions do, and this is a deliberate consequence of how they are treated. The gland extends into the dermis, and destroying it completely would mean going deep enough to leave a small depressed scar in its place. Treatment therefore reduces the glandular bulk and flattens the lesion while preserving the skin surface, accepting that a proportion will slowly re-enlarge over years and can be treated again.
Not meaningfully. Topical acids and retinoids act on the epidermis and the follicular opening; the enlarged gland sits beneath both. Oral isotretinoin can shrink sebaceous glands substantially, and lesions often flatten while a patient is taking it — but they generally re-enlarge afterwards, and that is not a reason to take a systemic drug on its own. Physical reduction of the lesion is the direct approach.
A milium is a small keratin cyst — hard, white, distinctly dome-shaped, no central dip — and it is removed by a fine incision and expression of the keratin pearl. Sebaceous hyperplasia is soft, often yellowish, has a central depression marking the duct, and contains nothing expressible. The two look similar at arm's length and need entirely different procedures, which is why they are distinguished before treatment rather than during it.
Gradual accumulation with age is the usual explanation — sebaceous glands enlarge over time and oily skin types develop more of them. A sudden crop in a shorter period is worth mentioning at consultation, particularly in anyone on long-term immunosuppressive therapy such as ciclosporin, where multiple sebaceous hyperplasias are a recognised association. It does not change the benign nature of the lesions, but it is useful context.

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