Skin Tag, Mole, Milia or Wart? Telling Small Skin Growths Apart

Reviewed by Dr Eugene Lim | MBBS, Dr Cindy’s Medical Aesthetics, Singapore. Fully registered with the Singapore Medical Council, practising alongside Dr Cindy Yang.

A small bump has appeared, or you have finally looked closely at one that has been there for months.

Five observations can narrow most small skin growths into a short list. A soft, skin-coloured bump on a stalk in a fold may be a skin tag. A flat or gently raised brown spot with an even colour may be a mole. A firm white pearl of 1 to 2 mm that stays put may be a milium.

A hard, rough bump that interrupts the skin lines and may show tiny black dots suggests a wart. A bright red dome of 1 to 4 mm on the trunk may be a cherry angioma. A waxy brown patch that looks stuck on may be a seborrhoeic keratosis.

The observations are colour, stalk, feel, surface and site. They are clues rather than a diagnosis. The sixth question is whether the growth has changed, because a new, growing, bleeding, crusting or otherwise changing lesion deserves a doctor’s examination rather than a name assigned at home.

This article is a field guide for narrowing down what the growth might be. Treatment belongs to the pages it links to, and diagnosis comes before removal.

Why the same bump gets six different names

Patients arrive with one word for everything. A wart on the neck is called a skin tag, a seborrhoeic keratosis on the temple is called a mole, a cluster of syringomas under the eye is called milia, and a milium is called a whitehead.

They are different structures, arising from different components of the skin, which is why the same few observations can narrow the possibilities surprisingly quickly.

The two-minute triage runs like this. Colour first. Brown or black brings pigmented lesions such as a mole or seborrhoeic keratosis into the differential, although skin tags and warts can also be pigmented. White suggests keratin-containing lesions such as milia or closed comedones. Red suggests a vascular or inflamed lesion. Skin-coloured leaves possibilities including a skin tag, wart, sebaceous hyperplasia, syringoma or raised mole.

Then the stalk. A growth hanging from a narrow base and moving from side to side is characteristic of a skin tag, although filiform warts and some raised moles can also project from the skin.

Then the feel and surface. A skin tag is usually soft. Milia are typically firm and smooth. Warts tend to be firmer and rougher. Seborrhoeic keratoses often have a waxy or stuck-on surface.

Then the site. Folds and friction zones favour tags. Hands and soles are common sites for warts. Cheeks and eyelids are common sites for milia and syringomas. The trunk commonly develops cherry angiomas and seborrhoeic keratoses.

A doctor adds the clinical history, examination and, where appropriate, magnification or dermoscopy. Most importantly, the doctor decides whether the lesion has enough uncertainty or any suspicious feature to require specialist assessment rather than cosmetic removal.

Skin tags: soft, on a stalk, in the folds

A skin tag is a soft, skin-coloured or slightly brown growth that hangs from the skin on a narrow stalk. Most are small. They sit where skin meets skin or where something rubs: the neck under a collar, the armpits, the groin, under the breasts, and sometimes the eyelids.

The feel is a useful clue. A typical tag is soft, moves freely on its stalk and does not usually hurt. A tag that twists on its stalk can become dark purple or black and turn sore or swollen.

That history may strongly suggest a thrombosed or twisted skin tag, but a newly dark, painful or otherwise changing growth should still be examined rather than diagnosed from colour alone.

Skin tags are associated with friction and are more common with increasing body weight. Multiple skin tags have also been associated in studies with insulin resistance and impaired glucose metabolism, although the presence of skin tags does not by itself diagnose either condition. What skin tags are, why they form and who gets them is covered in full in the clinic’s article on the subject.

Skin tags are treated in-house at both the Orchard and Tampines clinics. A tag can be removed at its base, and several may be treated in the same sitting where appropriate. The clinic’s skin tag removal page sets out the available techniques, while the procedure and recovery are discussed in what to expect from laser skin tag removal.

What it is mistaken for. A filiform wart, which can also project from the skin but tends to have a rougher or more irregular surface. A raised mole on the neck can also resemble a tag.

Moles: pigment, and where change matters particularly

A mole is a benign proliferation of melanocytes, the pigment-producing cells in the skin. A typical mole may be flat or raised, fairly even in colour, symmetrical and clearly edged.

Many common moles are under 6 mm across, but 6 mm is not a dividing line between benign and malignant. Benign moles can be larger, and melanomas can be smaller.

Change deserves particular attention. A mole that changes in size, colour, shape or surface, or that starts to bleed, itch or crust without an obvious explanation, needs a doctor.

Two familiar checks help identify lesions worth examining more closely. The ABCDE criteria look for asymmetry, an irregular border, variation in colour, diameter above 6 mm and evolution over time. The ugly duckling sign asks whether one mole looks different from the rest of that person’s moles.

Neither is a home diagnostic test. Both, and how melanoma can present on Asian skin, are set out in Is this mole normal?, the article to read if change is the reason you are looking.

Two flat brown marks that patients call moles are something else. Solar lentigines are flat brown marks associated with cumulative sun exposure, while melasma typically produces broader, often symmetrical areas of pigmentation. Both are covered in the article on pigmentation treatment.

Moles are assessed and, where appropriate, removed in-house at both the Orchard and Tampines clinics. Removal is decided by the type and features of the mole.

A mole with a suspicious or uncertain feature is different. It is not treated as a routine cosmetic removal. The clinic refers suspicious lesions for specialist assessment, where the appropriate diagnostic and biopsy pathway can be determined.

The cosmetic removal methods used for appropriately assessed benign moles, how the doctor chooses between them and what happens to the mark are set out in how doctors choose a mole removal method.

What it is mistaken for. A seborrhoeic keratosis, which can also be brown but often has a waxy or stuck-on surface. A darker skin tag, which projects from the skin. A flat wart on the face, which may be slightly rough and occur in multiples. A pigmented basal cell carcinoma can also resemble a mole, which is another reason a pigmented growth is examined before it is removed.

Milia: firm white cysts that do not pop

A milium is a tiny cyst containing keratin, the protein found in the outer layer of skin. It sits beneath a thin roof of skin without the open pore of a comedone.

Milia are typically white or cream, dome-shaped and firm, often around 1 to 2 mm across. They commonly occur on the cheeks, eyelids, around the eyes and on the forehead, either alone or in groups. In Singapore they are often called milia seeds.

Milia may arise spontaneously or develop after skin injury, blistering, burns or certain resurfacing procedures. Occlusive skincare products may also contribute in some people, particularly around the eyes, although a particular product cannot always be identified as the cause.

A whitehead is a different structure: a closed comedone produced when a follicular opening becomes blocked with sebum and keratin. Whiteheads are particularly common where sebaceous glands are dense, such as the forehead, nose and chin, and may resolve or become inflamed into acne lesions. Whiteheads are covered in the article on acne treatment.

Milia are treated in-house at both clinics. Treatment involves creating access to the keratin within the cyst and removing it appropriately. The clinic’s approach, recurrence and treatment of under-eye milia are covered in milia seed removal in Singapore.

What it is mistaken for. A whitehead, which is part of the acne process. A syringoma, which is usually skin-coloured or yellowish and commonly occurs in clusters around the eyes. Sebaceous hyperplasia, which tends to be larger and may have a central depression.

Warts: rough, viral, and able to spread

A wart is caused by infection of the epidermis with certain types of human papillomavirus, or HPV. The virus stimulates growth of the outer layers of skin, producing a firm or rough lesion whose appearance varies with the type of wart and where it occurs.

Warts commonly appear on the hands, fingers and around the nails, on the soles, on the face and on the knees.

Two clues are particularly useful on the hands and feet. One is pinpoint black or dark red dots, representing thrombosed small blood vessels within the wart. The other is interruption of the normal skin lines. A corn or callus tends to preserve the skin lines, while a wart often interrupts them.

Neither sign is present in every wart, so they help narrow the diagnosis rather than settle it alone.

Warts can spread. HPV can pass through direct skin contact and contaminated surfaces, and picking or scratching can spread lesions to nearby skin.

Warts also come in forms that resemble other growths. Plantar warts on the sole are pushed inward by pressure and can resemble a corn or callus. Flat warts on the face may be smooth-topped, skin-coloured or light brown and occur in multiples. Filiform warts on the face and neck project outward and are easily mistaken for skin tags.

Many warts eventually resolve through the immune response, particularly in children, although the time course varies considerably. Recurrence can occur after treatment because removing the visible lesion does not guarantee that all HPV-infected tissue has been eliminated.

Warts are treated in-house at both the Orchard and Tampines clinics. The clinic uses ablative laser among its treatment options; the different types, recurrence and treatment considerations are covered in wart removal in Singapore.

What it is mistaken for. A corn or callus, particularly on the sole. A skin tag, which is softer and smoother. A mole, particularly when the wart is flat and pigmented.

Cherry angiomas: the small red dot

A cherry angioma is a common benign vascular growth made up of small blood vessels within the skin. It is typically bright red, sometimes darker red or purple, and may be flat or form a smooth small dome.

They occur particularly on the trunk and upper limbs and become increasingly common with age.

Some cherry angiomas partly blanch under pressure, but this is not reliable enough to diagnose one at home. A stable red dot that has been unchanged for years is generally more reassuring than a new red lesion that is growing or repeatedly bleeding.

Other red growths behave differently and need assessment. A pyogenic granuloma, for example, can grow rapidly and bleed very easily. Some skin cancers can also be pink or red rather than pigmented.

Any red or pink growth that is growing, changing, ulcerating or bleeding without an obvious injury should therefore be examined rather than assumed to be an angioma.

Cherry angiomas are treated in-house at both clinics. The clinic uses its yellow-light laser at 577 nm for suitable lesions, targeting haemoglobin within the vessels. The treatment is described on the cherry angioma removal page and in the article on the yellow-light laser.

What it is mistaken for. A small bruise or area of bleeding under the skin, which usually changes and fades with time. An inflamed pimple, which may be tender and resolve. An irritated seborrhoeic keratosis, which usually has a more textured surface.

Seborrhoeic keratoses, sebaceous hyperplasia and syringomas, in brief

Three further growths are so often mislabelled that a field guide is incomplete without them. Each is covered in full, with its treatment options, in the article on seborrhoeic keratosis, sebaceous hyperplasia, syringomas and xanthelasma.

Seborrhoeic keratosis. A common benign epidermal growth that may be light brown, dark brown or black, with a sharply defined, waxy, rough or stuck-on appearance. They become more common with age and frequently occur on the face, chest and back.

In more deeply pigmented skin, a related presentation called dermatosis papulosa nigra produces multiple small dark papules, particularly on the face.

Seborrhoeic keratoses can sometimes resemble melanocytic lesions and other skin growths. A lesion that cannot confidently be identified as benign, particularly one that is changing, belongs with medical assessment rather than immediate cosmetic destruction.

Sebaceous hyperplasia. An enlarged sebaceous gland, usually appearing as a soft, yellowish or skin-coloured papule, often with a small central depression. It commonly occurs on the forehead, cheeks and nose and becomes more frequent with age.

The central depression and yellowish tone can be useful clues, but sebaceous hyperplasia can occasionally resemble other lesions, including basal cell carcinoma, so uncertain lesions should be examined.

Syringomas. Benign growths arising from sweat ducts within the skin. They commonly appear as clusters of small, firm, skin-coloured or slightly yellow papules around the lower eyelids, often on both sides.

Patients frequently mistake them for milia. Milia contain keratin and tend to look whiter and more cyst-like, while syringomas are usually skin-coloured or yellowish and occur in characteristic clusters.

Seborrhoeic keratoses, sebaceous hyperplasia and syringomas are all assessed and treated in-house where appropriate at both the Orchard and Tampines clinics. The exact treatment depends on the diagnosis, site, depth and individual lesion.

Which of these need a doctor, and which can wait

Some growths deserve medical assessment sooner: one that is changing in size, shape, colour or surface; one that bleeds repeatedly without being knocked; one that ulcerates or develops a crust that does not heal; one that becomes persistently painful, itchy or tender without an obvious explanation; a red or pink growth that appears and grows rapidly; or any growth whose identity is uncertain.

Anything pigmented that you want removed should also be examined first. If a pigmented lesion has suspicious or uncertain features, the clinic’s pathway is specialist referral rather than cosmetic removal.

Warts may also be worth treating when they are spreading, painful, affecting function, occurring on cosmetically sensitive areas or simply proving persistent.

Some clearly benign, stable growths can wait: an unchanged skin tag, a typical milium, a stable cherry angioma that is not bleeding, or another growth that has already been assessed and identified as benign.

“Can wait” means treatment can usually be arranged at a convenient time. It does not mean that home cutting, burning or chemical removal is a good substitute for knowing what the growth is.

Singapore adds one consideration. Year-round UV exposure and a population with a wide range of skin tones mean that both sun protection and the risk of post-inflammatory hyperpigmentation matter. Burning, picking or aggressively treating a harmless growth can leave pigmentation that lasts much longer than the original lesion.

The method matters even when the growth itself is entirely benign.

Four things patients commonly get wrong

Tying thread or dental floss around a skin tag. The idea is to cut off the blood supply until the tag drops off. The first problem is that you need to know that the growth is actually a skin tag. A filiform wart or raised mole can look similar.

The second is that home ligation can produce pain, bleeding, swelling or infection. In clinic, a confirmed skin tag can be removed under controlled conditions using a method appropriate to its size and site.

Squeezing or picking a milium. A milium does not have the open follicular pore of a comedone, so squeezing it usually traumatises the surrounding skin rather than emptying it cleanly.

Trying to open it with a needle adds the risks of infection, scarring and post-inflammatory pigmentation. The mark left by the attempt can last considerably longer than the original milium.

Mole removal creams and pens bought online. These chemically or thermally damage tissue without first establishing what the lesion is.

That creates two problems: the treatment itself can cause burns, scars and pigmentation, and destroying a pigmented lesion can interfere with subsequent assessment if the lesion was not benign.

A pigmented growth should be examined first. A lesion with suspicious features is referred for specialist assessment rather than cosmetically destroyed.

“A dermatologist is the only option.” Many common benign skin growths can be assessed and treated by doctors in medically led clinics. At Dr Cindy’s Medical Aesthetics, the lesions discussed in this article are assessed and treated in-house where appropriate at both the Orchard and Tampines clinics.

The important distinction is not the clinic label. It is whether the growth has been properly assessed before treatment and whether the doctor recognises when a lesion should not be treated cosmetically.

A suspicious lesion belongs with specialist assessment, and that is the clinic’s referral pathway.

What a consultation involves

The visit begins with the history, because the history does much of the work: how long the growth has been there, whether it has changed, whether it bleeds, itches or hurts, and whether there are others like it.

A skin tag that suddenly became painful, a red lump that appeared several weeks ago and a brown lesion unchanged for years are three different conversations before anyone examines the skin.

The doctor then examines the growth and, where appropriate, may use magnification or dermoscopy to assess its features more closely. The aim is to establish what the lesion is before deciding how — or whether — it should be removed.

All the benign growths discussed in this article — moles, skin tags, warts, milia, cherry angiomas, seborrhoeic keratoses, sebaceous hyperplasia and syringomas — can be assessed and treated in-house where suitable. Assessment and removal are available at both the Orchard and Tampines clinics.

The treatment method depends on the diagnosis. Different lesions may be suited to laser or another removal technique, while some need no treatment at all.

A growth with a suspicious or uncertain feature follows a different pathway. It is not removed cosmetically simply because it is inconvenient or the patient wants it gone. The clinic refers suspicious lesions for specialist assessment, where further examination and, when indicated, biopsy and histological examination can be arranged.

Before treatment of a benign growth, you should know what the growth is, why the proposed method suits it, what the treated site is likely to look like afterwards, how to care for it while it heals and what changes should bring you back.

Several benign growths may be treated in one visit where appropriate.

You leave knowing what the growth is likely to be, whether it needs removing for medical reasons or only because you want it gone, which treatment is appropriate and why, and whether any of your other growths deserve a second look.

Where to be seen, and who sees you

Dr Cindy’s Medical Aesthetics assesses and removes small skin growths, including moles, skin tags, warts and milia, at both of its clinics.

Orchard. 360 Orchard Road, #05-06 International Building, Singapore 238869. Monday and Thursday 11.30am to 7pm, Tuesday, Wednesday and Friday 10am to 8pm, Saturday 10am to 3pm. Closed Sunday and public holidays.

Tampines. 1 Tampines Central 5, #07-01 CPF Tampines Building, Singapore 529508. Monday to Friday 11.30am to 9pm, Saturday 10am to 7pm. Closed Sunday and public holidays.

Assessments are carried out by the clinic’s doctors: Dr Cindy Yang, founder and medical director; Dr Eugene Lim, fully registered with the Singapore Medical Council; and Dr Grace Su, a general practitioner working in aesthetic and lifestyle medicine.

Some presentations belong with a dermatologist or a hospital skin clinic from the start: any feature suggestive of melanoma or another skin cancer, a growth that has already been biopsied as atypical, a personal or family history of melanoma, a rapidly changing growth in a child, and extensive warts or warts in a patient whose immune system is suppressed. If a growth is assessed at the clinic and any of these applies, you will be told so and referred.

In any clinic, five things are worth looking for: a doctor registered with the Singapore Medical Council; an examination of the growth itself, with a dermatoscope where it is pigmented; a method chosen for the type of growth, and never the other way round; tissue sent for histology whenever a growth is removed because of any suspicious feature; and a plain statement of the expected mark and healing time before anything is done.

Dr Cindy’s Medical Aesthetics, a doctor-led clinic in Singapore since 2010, puts a name on the growth before any method is chosen.

Frequently asked questions

How do I tell a skin tag from a mole?

A skin tag is soft, skin-coloured or slightly brown, and hangs from a narrow stalk that lets it wobble from side to side. It sits in folds and friction zones such as the neck, armpits and groin, and it stays the same for years. A mole is a cluster of pigment cells with a broad base, one or two even shades of brown, a smooth edge and a diameter under 6 mm. A tag that twists on its stalk can turn black within a day, which is the change most often mistaken for a changing mole.

Is this white bump a milia seed or a whitehead?

Press it. A milium is a firm, white, 1 to 2 mm cyst of keratin with no pore, so it does not yield, does not empty and stays in the same place for months, most often on the cheeks and around the eyes. A whitehead is a blocked pore under a thin film of skin; it is softer, sits where oil glands are dense on the forehead, nose and chin, and changes over days to weeks, either resolving or becoming an inflamed pimple.

How do I identify a wart?

A wart is a hard, rough, raised bump with a surface like a tiny cauliflower or a patch of grit. Two signs confirm it. Tiny black or dark red dots show through the surface, which are clotted blood vessels. On the palms, fingers and soles, the fine skin lines run around a wart and stop at its edge, while over a corn they continue across. Warts are viral, so they appear near one another and spread along scratch lines.

What is the difference between a seborrhoeic keratosis and a mole?

A seborrhoeic keratosis is a waxy, thickened patch of surface skin cells, light brown to black, with a sharply defined edge and a rough or greasy surface that looks stuck onto the skin. It appears from the 40s onward, usually several at once, on the face, chest and back. A mole is a cluster of pigment cells, flat or a smooth dome, with an even colour. A dark keratosis that has changed is examined by a doctor and, where there is doubt, referred for specialist assessment so that tissue can be examined.

What is the small red dot on my skin?

A bright red, sometimes purple dome of 1 to 4 mm on the chest, back, shoulders or arms is usually a cherry angioma, a small knot of dilated blood vessels. Pressing it makes it fade partly and the colour returns when pressure is released. Cherry angiomas appear from the 30s onward and multiply with age. A red lump that has grown quickly over a few weeks, bleeds without being knocked or is changing shape needs to be assessed by a doctor.

Are the bumps around my eyes milia or syringomas?

Milia are white, domed, firm, 1 to 2 mm cysts that appear singly or in small numbers and can be opened by a doctor to release the keratin inside. Syringomas are benign growths of the sweat ducts: clusters of firm, flat-topped, skin-coloured or slightly yellow papules of 1 to 3 mm, spread symmetrically across both lower eyelids, more common in women and in East Asian skin, and rooted in the deeper skin. Colour, shape and symmetry separate them.

Which skin growths are harmless and which need a doctor?

A soft skin tag that has been the same for years, a milium, a stable cherry angioma and a whitehead can wait for a convenient time. A doctor should see any growth that is changing in size, shape, colour or surface, bleeding without injury, crusting without healing within two to three weeks, painful or itchy for no reason, a red lump that grew within weeks, warts that are spreading or hurt to walk on, and any pigmented growth you want removed, because it is examined before a method is chosen.

Can I remove a skin growth at home?

Home removal destroys the growth without anyone confirming what it was, and in Fitzpatrick III to V skin it commonly leaves a dark mark that lasts months. Thread around a skin tag produces swollen, bleeding, half-strangled tags, and sometimes cuts into a wart or a mole. Squeezing a milium bruises the skin and leaves the cyst wall in place. Mole creams and pens burn the skin and can hide a melanoma beneath a scar. A doctor names the growth first, then chooses the method.

References

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2. Grob JJ, Bonerandi JJ. The “ugly duckling” sign: identification of the common characteristics of nevi in an individual as a basis for melanoma screening. Arch Dermatol 1998;134(1):103-104.

3. Berk DR, Bayliss SJ. Milia: a review and classification. J Am Acad Dermatol 2008;59(6):1050-1063.

4. Kwok CS, Gibbs S, Bennett C, Holland R, Abbott R. Topical treatments for cutaneous warts. Cochrane Database Syst Rev 2012;(9):CD001781.

5. Massing AM, Epstein WL. Natural history of warts: a two-year study. Arch Dermatol 1963;87:306-310.

6. Rasi A, Soltani-Arabshahi R, Shahbazi N. Skin tag as a cutaneous marker for impaired carbohydrate metabolism: a case-control study. Int J Dermatol 2007;46(11):1155-1159.