On this page
Dr. Chrysoula I. Liakou MD, PhD
- Treated online: Assessment and infection treatment online. A sebaceous cyst is confirmed from photos and the story by video, antibiotics are prescribed when the surrounding skin shows spreading infection, and removal or drainage is arranged in person.
- What it is: a keratin-filled sac under the skin from a blocked follicle; most are epidermoid cysts on the face, neck, chest and back, or inherited pilar cysts on the scalp, commonest in adults aged 20 to 60 and in men about twice as often.
- How long: a sebaceous cyst grows slowly over months to years and never disappears on its own because the sac remains; an infected cyst settles within a week of antibiotics or drainage, and complete removal of the sac is what stops it returning.
- Never squeeze: squeezing a cyst pushes the contents deeper into the tissue and inflames it, invites infection, and leaves the sac behind, so the cyst refills; home lancing with pins or blades adds scarring to the same outcome.
- Infection signs: a cyst that swells over a day or two, turns red and warm, becomes tender or leaks foul-smelling material is infected or inflamed; fever or redness spreading beyond the lump means in-person care.
- Emergency: call 112 if a skin infection comes with high fever and shaking, confusion, rapid breathing or a racing heart.
A lump that is hard, fixed in place, irregular, growing quickly over weeks, bleeding or breaking down needs in-person examination promptly rather than an online opinion; the same goes for any new lump in the breast, in the neck of someone with weight loss or night sweats, or deep lumps you can feel but not see. For a soft, slow, movable lump under normal skin, online assessment is a sensible first step.
Can a sebaceous cyst be removed online?
No. No honest service claims otherwise. Removal of a sebaceous cyst is a minor in-person procedure under local anaesthetic that takes out the whole sac. An online doctor handles everything around it: confirming the lump behaves like a cyst, treating infection, advising whether removal is worthwhile, and writing the referral.
That assessment step has real value, because most lumps people worry about are benign, and a structured photo-and-video review can say so with reasonable confidence or, just as usefully, flag the exceptions that deserve hands-on examination. On Mobi Doctor, a licensed doctor gives you that answer over video, usually within 15 minutes, without a clinic visit for something that may need only reassurance and a watchful eye.
How an online consultation helps with a sebaceous cyst
- A confident first read of the lump: the doctor assesses the features that mark a typical cyst (slow growth, mobility, a central punctum) against the ones that do not fit, and tells you which side yours lands on.
- Prompt infection triage: a cyst that turns red, hot and painful needs decisions now: antibiotics, drainage referral, or urgent care. The doctor makes that call in the consultation.
- Honest advice on removal: when removal is worthwhile, when leaving it alone is wiser, and why squeezing it yourself fails. No procedure is sold, because none is performed online.
- A referral that says the right things: if you choose removal, the consultation produces a proper referral describing the cyst, its history and any infections, which is what surgical clinics actually need.
📷 Take two photos in daylight: one wider shot showing where the lump sits, with a coin or ruler next to it for scale, and one sharp close-up from the side to show how far it rises. If you can see a small central dark pore (the punctum), get that in focus, and photograph any redness around it.
What the doctor checks in an online sebaceous cyst consultation
The consultation works through the features that separate a harmless cyst from lumps that need more. The doctor will typically assess:
- How long and how fast: cysts grow slowly over months to years; rapid growth over weeks does not fit and changes the plan.[1]
- Mobility: on the video call the doctor asks you to move the lump; a cyst slides with the skin, while a lump fixed to deeper tissue is a different conversation.
- The punctum: the small central dark pore many epidermoid cysts show, a genuinely useful diagnostic detail a close-up photo captures.
- Site and size: scalp, face, neck, back, chest and genital skin are classic cyst territory, and size shapes both the removal question and the referral.
- Inflammation history: redness, pain, swelling, discharge and its smell, previous flare-ups, and anything that has already been squeezed or drained.
- Your background: diabetes or a weakened immune system lower the threshold for treating infection; blood thinners matter for procedure planning; many cysts from a young age point to rarer syndromes worth an in-person look.
- The worry list: hardness, fixation, irregular borders, ulceration or rapid growth, checked deliberately, because those features move a lump out of the reassure-online category.[1]
What is a sebaceous cyst?
A sebaceous cyst is a slow-growing, dome-shaped lump under the skin, formed when a blocked hair-follicle unit builds a sac that fills with keratin, a soft, cheese-like material with a distinctive smell.[5] Most are epidermoid cysts; the similar pilar cysts favour the scalp.[4] They are benign, common, and often need no treatment at all.[1]
The name is worth a footnote: "sebaceous cyst" is the term everyone searches, but most of these cysts arise from the follicle lining rather than the oil gland itself, which is why doctors write epidermoid or pilar cyst in their notes. Nothing about that changes what you should do, and this page uses the familiar name. Typical cysts sit anywhere hair grows, from a pea to a golf ball in size, and can stay unchanged for years. What they do not do is turn cancerous with any meaningful frequency: the reason unusual lumps get examined in person is to make sure they were never cysts in the first place, not because a quiet cyst is dangerous.[1]
Is my cyst infected? Signs to watch
An infected or inflamed cyst declares itself over a day or two: the lump swells, the skin over it turns red and hot, it becomes tender to touch, and pressure builds until some leak foul-smelling material. Fever or spreading redness beyond the lump means the infection is escaping the cyst and needs care the same day.[2]
Two honest points about treatment. First, antibiotics are not automatic: an inflamed cyst is often sterile inflammation from a leaking sac, and antibiotics are prescribed when there are genuine signs of bacterial infection, not for every red lump; this keeps antibiotics working for the infections that need them.[2] Second, a tense, painful collection of pus does not respond to tablets alone: it needs incision and drainage in person, and the consultation's job is to recognise that quickly and send you to the right place. What never helps is squeezing. Squeezing pushes cyst contents deeper into the tissue, multiplies inflammation, raises the infection risk, and means the cyst almost always refills, because the sac stays behind.
When is removal worth it?
Removal is worthwhile when a cyst keeps getting infected, hurts, catches on clothing or a razor, sits somewhere visible enough to bother you, keeps growing, or cannot be confidently diagnosed from its behaviour. A quiet cyst that does none of those things can simply be left alone; that is a legitimate plan, not neglect.[1]
When you do choose removal, the details matter. The definitive procedure excises the whole sac, usually under local anaesthetic in 20–40 minutes, because any sac left behind can refill; that is why home lancing and squeeze videos end in recurrence.[1] Every excision leaves some scar, and on the face that trade-off deserves a candid conversation with whoever operates. Timing matters too: surgeons prefer to remove cysts between infections, when tissue planes are clean, so a recently inflamed cyst is usually settled first and removed later. The consultation maps your local route to minor skin surgery: who performs it, whether it is covered when the reason is mainly cosmetic, and how long the wait is likely to be.
Is it a cyst or something else?
Several lumps share the neighbourhood. A lipoma is a soft, doughy, painless lump of fatty tissue, deeper than a cyst and without a punctum. A boil grows painful and red within days rather than months and behaves like the infection it is. A swollen lymph node in the neck, armpit or groin usually follows an infection and settles; nodes that stay enlarged for weeks belong with an in-person doctor. Deep acne can produce cyst-like lumps along the jaw and back, covered on the acne treatment page, and spreading hot redness without a discrete lump points to cellulitis. The reassuring pattern for a cyst is slow, soft, mobile and indifferent; anything hard, fixed, irregular, rapidly growing or ulcerating is treated as not-a-cyst until someone has examined it properly.[1]
What happens next with a sebaceous cyst?
The plan follows how the cyst is behaving. This is the framework the doctors use, aligned with the cited guidance:[1][2]
Swipe sideways to compare →
| Presentation | Likely first step | Suitable for online care? | When referral or in-person care is needed |
|---|---|---|---|
| Soft, slow-growing, movable lump with a central pore, not bothering you | Confident reassurance and a watch-and-wait plan with clear recheck triggers | Usually yes | Only if it changes: growth, pain, redness or discharge |
| Quiet cyst that is unsightly, catches, or keeps enlarging | Honest discussion of removal, then a referral for excision of the whole sac | Yes, for assessment and referral | The excision itself is always an in-person procedure |
| Cyst newly red, swollen and tender | Same-day assessment; antibiotics only when there are signs of bacterial infection | Often yes | A tense, painful pus collection needs in-person drainage, not tablets alone |
| Spreading redness, fever, or an infected cyst on the face | In-person care the same day | No: assessment and urgent redirection only | Always: facial and spreading infections escalate quickly |
| Hard, fixed, irregular, fast-growing or ulcerated lump | Prompt in-person examination, with imaging or biopsy as needed | No: assessment and urgent referral only | Always, to establish what the lump actually is |
Not sure which row is your lump? A doctor can tell you in one consultation.
See available times →Treatment options for a sebaceous cyst
What you can do yourself
For a quiet cyst: hands off, literally. Do not squeeze, lance or tape things to it; keep the area clean, and note its size (a photo next to a coin every month or two is a perfectly good record). For an early inflamed cyst, a clean warm compress a few times a day can ease discomfort while you arrange assessment, and simple pain relief from the pharmacy is reasonable. There is no cream, drawing salve or home remedy that dissolves a cyst sac, and the internet's puncture tutorials reliably end in infection, scarring and a cyst that returns anyway.
Prescription treatment and procedures
A prescription is never issued without a consultation. When an assessed cyst shows genuine signs of bacterial infection, the doctor can prescribe an antibiotic course and set review points, with the honest caveat that antibiotics treat the infection around a cyst, never the cyst itself: the sac survives every course, which is why recurrent infection is an argument for removal rather than repeat prescriptions.[2] Drainage of a painful pus collection and definitive excision of the sac are in-person procedures, arranged by referral; where you are in Europe determines who does them and how quickly, and the doctor confirms your local pathway during the consultation.
When online help is enough, and when you need in-person care
Handled online: first assessment of a new lump that behaves like a cyst; watch-and-wait plans with defined recheck triggers; prompt triage and, when appropriate, antibiotic treatment of infected cysts; honest advice on whether removal is worth it in your case; and referral letters for excision, including after previous drainage elsewhere.
In-person care: every removal, because it is a physical procedure; tense painful collections needing drainage, the same day; infected cysts on the face or with spreading redness or fever; any lump that is hard, fixed, irregular, rapidly growing, bleeding or ulcerated, promptly, for examination and sometimes imaging or biopsy; breast lumps and deep lumps, which need physical examination by default; and multiple cysts from a young age, which occasionally signal conditions that deserve a specialist once-over. If a photo assessment cannot honestly distinguish your lump from the other skin changes assessed online, the doctor says so and routes you to in-person care, with a full refund. More is at skin conditions treated online.
When to get in-person care
Go the same day for a cyst with spreading hot redness, fever or red streaks tracking away from it, for an abscess that is tense and severely painful, or for any facial infection near the eye. Call 112 immediately if a skin infection comes with high fever and shaking, confusion, rapid breathing or a racing heart, which can signal sepsis.[3]
How Mobi Doctor works
- Book a time that suits you: open daily 7am–11pm CET. You can see a doctor over video, usually within 15 minutes. No subscription, exact price up front.
- Upload your lump photos, then speak to a licensed doctor: a private video call: you describe what you feel, the doctor asks what matters, and you agree the right plan together.
- Leave knowing your next step: an honest assessment, a clear plan, and a direct referral when in-person care is the right call, or a full refund.
No sign-up needed
Not sure it’s a sebaceous cyst? Tick every symptom you have to see each condition page that mentions it. It finds the right page, not a diagnosis: a doctor gives you that on a video call.
Tap the body — an area or a point — to browse symptoms anywhere
Similar symptoms, different condition? Lump Under the Skin can start the same way. Compare them, or look up any other symptom in the full symptom checker.
Frequently asked questions about a sebaceous cyst
What is a sebaceous cyst?
A sebaceous cyst is a round, smooth lump under the skin formed when a hair follicle or pore becomes blocked and a sac of skin cells fills with soft keratin. Most lumps called sebaceous cysts are epidermoid cysts, on the face, neck, chest and back, or pilar cysts on the scalp; true sebaceous gland cysts are rare. They are benign, slow-growing, and often show a tiny central pore.
What causes a sebaceous cyst?
A sebaceous cyst forms when the opening of a hair follicle is blocked or damaged, by acne, a minor injury, surgery or an ingrown hair, and surface skin cells become trapped beneath the skin, where they keep producing keratin inside a sac. Pilar cysts on the scalp run in families. Oily skin, acne, a history of sun damage and some rare inherited conditions make sebaceous cysts more likely.
What does a sebaceous cyst look and feel like?
A sebaceous cyst is a dome-shaped, skin-coloured or slightly yellow lump, usually 0.5 to 5 cm across, that is smooth, firm but slightly squashy, movable under the skin, painless, and often marked by a small dark central pore; sometimes a thick, cheesy, foul-smelling material can be expressed. An infected sebaceous cyst becomes red, hot, swollen, painful and may leak pus.
Can an online doctor remove a sebaceous cyst?
No, removing a sebaceous cyst is a minor surgical procedure done in person under local anaesthetic. What the online consultation does is confirm the lump behaves like a cyst, treat infection when appropriate, advise on whether removal is worth it, and write the referral so you arrive at the right clinic with the lump already assessed and documented.
Could my sebaceous cyst be cancer?
A typical sebaceous cyst, soft, slow-growing, movable, often with a central pore, is benign, and turning cancerous is very rare. The features that deserve prompt in-person examination are different from the start: a lump that is hard, fixed, irregular, growing fast over weeks, bleeding, ulcerated, or appearing in the breast or with weight loss. The doctor sorts those from an ordinary cyst in one consultation.
Can I pop or squeeze a sebaceous cyst myself?
Please do not. Squeezing a sebaceous cyst forces the contents deeper into surrounding tissue, inflames it, invites infection, and leaves the sac in place, so the cyst refills anyway. Home lancing with pins or blades adds scarring and worse infections to the same outcome. A warm compress for a tender cyst, and a doctor for one that is inflamed, are the safe options.
Will antibiotics make a sebaceous cyst go away?
No. Antibiotics can settle a bacterial infection around a sebaceous cyst, and they are only prescribed when there are signs of one; many red, swollen cysts are inflamed rather than infected and settle with warmth and time. The sac itself survives every antibiotic course, which is why a cyst that keeps getting infected is better removed once the inflammation has settled.
How do I know if my sebaceous cyst is infected?
Watch for change over a day or two: the sebaceous cyst swells, the skin over it turns red and warm, it becomes tender, and foul-smelling material may leak from the pore. Fever, worsening pain, or redness spreading beyond the lump mean the infection is advancing and needs in-person care, where drainage under local anaesthetic may be done the same visit.
Will a sebaceous cyst come back after removal?
Rarely, if the whole sac is excised: complete removal is the point of the procedure, and recurrence after a full excision is uncommon. Recurrence is common after squeezing or simple drainage, because those leave the sac behind to refill. If a removed sebaceous cyst does return, mention it in the consultation, because a second excision with a wider margin usually settles it.
Does a sebaceous cyst go away by itself?
No. A sebaceous cyst can stay the same size for years, shrink a little after inflammation, or occasionally rupture and discharge, but the sac remains and refills, so it never truly disappears without removal. A small, painless cyst that does not bother you can be left alone indefinitely; one that is growing, repeatedly inflamed, or in the way is removed.
What can I do at home for a sebaceous cyst?
At home, leave a sebaceous cyst alone: no squeezing, piercing or hot needles. A warm, clean compress for a quarter of an hour a few times a day eases a tender or inflamed cyst and may help it drain through its pore on its own; keep the area clean, cover it if it leaks, take paracetamol for discomfort, and photograph it so growth or redness is obvious at the consultation.
Can sebaceous cysts be prevented?
Most sebaceous cysts cannot be prevented, because the follicle blockage happens on its own and pilar cysts are inherited. You can reduce the risk of new cysts by treating acne early, not squeezing spots, shaving with care to avoid ingrown hairs, and keeping oily, sun-damaged skin clean; and you can prevent an existing cyst becoming a problem by not squeezing it and having a troublesome one removed.
Is it a sebaceous cyst, a lipoma or a boil?
A sebaceous cyst sits in the skin, is smooth and firm with a central pore, and can become inflamed. A lipoma sits under the skin, is soft, doughy and mobile, has no pore, and never becomes infected. A boil is hot, red and painful from the start and comes to a head within days. Photos plus the story usually separate them, and a hard, fixed or fast-growing lump is examined in person.
Are sebaceous cysts on the scalp, genitals or in pregnancy any different?
Pilar cysts on the scalp are firmer, often multiple and inherited, and are removed in the same way. Sebaceous cysts on the scrotum or vulva are common and benign, but any lump inside the testicle or breast is examined in person without delay. In pregnancy, cysts can enlarge or inflame; infection is treated with pregnancy-safe antibiotics, and non-urgent removal usually waits until after the birth.
- Epidermoid cyst, DermNet New Zealand Trust, reviewed 2023.
- Boils, carbuncles and staphylococcal carriage: Clinical Knowledge Summary, NICE Clinical Knowledge Summaries, revised 2023.
- Cellulitis - acute: Clinical Knowledge Summary, NICE Clinical Knowledge Summaries, revised 2024.
- Trichilemmal (pilar) cyst, DermNet New Zealand Trust, accessed August 2026.
- Cutaneous cysts and pseudocysts, DermNet New Zealand Trust, accessed August 2026.
- Skin cyst, NHS, National Health Service (UK), reviewed May 2023.
This page is for information only and is not a substitute for a medical consultation. Guideline links are provided for transparency; treatment decisions are made with your doctor.
Related conditions
Related reading from the Mobi Doctor blog
When To Worry About A Lump Under Your Skin
Most lumps under the skin are harmless, such as cysts or lipomas. A lump may need medical review if it is hard, fixed, g...
Read article → Expert Health AdviceLump Behind Ear
What causes a lump behind the ear? A lump behind the ear is often caused by a benign skin cyst or swollen lymph node. L...
Read article →From the Mobi Doctor podcast
The 10 Most Common Travel Illnesses
The travel illnesses doctors see most often in Europe, and how to handle each one away from home.
Listen · 23 Feb 2026 → Podcast · 13:26How to Stay Healthy on a Long Flight
Practical steps for circulation, hydration and infection risk before, during and after a long flight.
Listen · 23 Feb 2026 → Podcast · 15:41Debunking Gut Health Myths
What the evidence really says about gut health, and the popular claims that do not hold up.
Listen · 23 Feb 2026 →Speak to a doctor about a sebaceous cyst over video, usually within 15 minutes
Licensed doctors · open daily 7am–11pm CET · exact price before payment
See available times →