What is a sebaceous cyst?
A sebaceous cyst — strictly speaking, most are epidermoid cysts — is a closed sac that forms under the skin when epidermal cells become trapped in the dermis, usually from a blocked follicle. The sac has a capsule that produces keratin: the whitish, pasty, characteristically smelly material patients recognise at once.
It is identified as a firm, rounded lump tethered to the skin (unlike a lipoma, which slides freely underneath), slow-growing, and often showing a visible central punctum or pore. It appears mostly on the scalp, face, ears, neck, back and genital area.
It is benign. But as long as the capsule exists, the cyst can keep growing, become inflamed or get infected at any time — which is why the definitive treatment is surgical.
When does a sebaceous cyst need surgery?
A small, stable cyst that has never been inflamed can be watched. Excision is indicated when:
- It is growing or has reached a size that distorts the contour of the area.
- It has ever been inflamed or infected. A cyst that has flared once tends to flare again, and each episode leaves more fibrosis and makes later surgery less clean.
- It hurts, bothers you or discharges foul-smelling material through the central pore.
- It sits in a visible or friction area — face, neck, scalp — where the scar also has to be good.
- The diagnosis is in doubt. If it does not behave like a cyst, it is investigated before anyone touches it.
How is sebaceous cyst removal performed?
It is minor outpatient surgery under local anaesthesia, in the office, taking 20 to 40 minutes. The patient walks out the same day.
The anaesthetic is infiltrated and a small incision is made — elliptical around the central punctum when there is one, oriented along the skin’s natural lines. The cyst is carefully dissected from the surrounding tissue and removed whole, with its capsule intact, ideally without rupturing it. That technical detail is everything: the capsule left behind is the cyst that comes back.
The wound is closed in layers with fine suture and the specimen is sent for histopathology to confirm the diagnosis. The result is explained at the follow-up visit, when the sutures come out.
A different scenario: the inflamed or abscessed cyst. Operating “hot” ruptures the capsule and guarantees recurrence, so the episode is controlled first — antibiotics and, if there is an abscess, drainage — and the definitive excision is scheduled a few weeks later, once the tissues have settled.
See the full guide: Post-surgical recovery and care.
Technique and scar: the plastic surgeon’s judgment
Sebaceous cysts frequently appear on the face, ears and neck — exactly where a poor scar shows for life. The plastic surgeon’s approach adds:
- A minimal elliptical incision along the skin’s tension lines or hidden in a crease.
- Complete dissection of the capsule without rupturing it: the single variable that decides whether the cyst returns.
- Layered, tension-free closure with fine suture — decisive on the face and ears.
- Histopathology of the specimen: the diagnosis is confirmed, not assumed.
- Correct handling of the inflamed cyst: settle first, excise later. The order matters.
Sebaceous cyst, lipoma or abscess? How to tell them apart
The three commonest “lumps” of the consulting room resemble each other and are treated differently:
- Sebaceous cyst: firm, tethered to the skin, often with a central pore; can become inflamed and discharge foul-smelling material. Excised whole with its capsule.
- Lipoma: soft, slides freely under the finger, no pore, never discharges. Benign fat; read how it is handled on the lipoma removal page.
- Abscess: hot, red, painful and rapid in onset. A minor emergency that is drained, not elective surgery.
- A lesion that demands study: firm, fixed to deep planes, fast-growing or ulcerating. Nothing is assumed: imaging and biopsy.
Possible risks and complications
This is minor surgery with uncommon complications: wound infection, bleeding or haematoma, a more visible scar than expected (particularly with a keloid history), temporary altered local sensation and recurrence of the cyst if the capsule was not removed intact — the most cited risk, and the reason technique matters more than speed.
If you have a history of keloid scarring, tell your surgeon beforehand: it changes the closure and the scar-care protocol.
Who is a good candidate?
Anyone in good health with a cyst that is growing, has flared, discharges or bothers them. The consultation examines the lesion, confirms it behaves like a cyst, sets the right surgical timing (never “hot”), and provides a clear quote. All surgery carries risk and requires a prior medical assessment. Results may vary according to each patient, their anatomy and their individual healing process.
Before and after
Most patients want to see before-and-after photographs before deciding. Out of respect for each person’s privacy, Dr. Arístides Arellano shows real cases —always with documented consent— during your in-person consultation, where you can review results from patients with a starting point similar to yours. Results may vary from patient to patient.
Approximate price in Puebla
The cost of sebaceous cyst removal depends on its size and location, on whether it has been inflamed or infected before (fibrosis makes dissection more laborious), on the number of lesions, and on whether the area demands a more exacting aesthetic closure, such as the face or ears. It is defined at the consultation, with a clear quote that includes histopathology. See also the surgery price list of Dr. Arístides Arellano. Approximate price — the definitive cost is set at your private consultation with Dr. Arístides Arellano.
Credentials
Dr. Arístides Arellano is a plastic surgeon holding a specialty licence: he practises under a Mexican medical licence (D.G.P. 1125959) and a specialty licence in Plastic & Reconstructive Surgery (0002008), both issued by the Directorate General of Professions (DGP), which reissued his certificate of professional standing in 2025. His career began before Mexico’s present-day specialty-board system existed: he belongs to the founding generation of plastic surgery in Puebla, the second generation of a surgical tradition started in 1971 by Dr. Francisco Arellano Ocampo. Trust is verified, not promised: both licences are public and anyone can look them up in the DGP’s National Registry of Professionals.
CO₂ laser and sebaceous cyst: why the capsule must come out
A sebaceous cyst is not burned away with a laser: it is excised. The reason is the capsule — the sac that produces the contents. If it is left behind, the cyst fills again and returns. That is the most common cause of recurrence.
Where the surgical CO₂ laser does help is with the incision and the field: CO₂ emits at 10,600 nm, a wavelength that tissue water absorbs almost completely. It therefore cuts in a very thin layer and seals the finest vessels as it goes: it incises and coagulates in the same pass. With less bleeding the plane between the capsule and healthy tissue is easier to see, and that plane is exactly what must be respected to remove it intact.
Dr. Arístides Arellano, plastic surgeon in Puebla, has the NovaPulse (Lumenis · Luxar) for this kind of minor skin surgery. If the cyst is inflamed or infected, the infection is controlled first: that is not the moment to excise it.
Documented training in dermatologic surgery
A cyst that is "squeezed" comes back; a cyst excised with its capsule does not. Dr. Arístides Arellano is a specialist in Plastic & Reconstructive Surgery authorised by the DGP since 1990 and a Fellow of the international dermatologic-surgery society:
- Fellow — International Society for Dermatologic Surgery — Nueva York · abril de 1991
- 2nd Argentine Congress of Dermatologic Surgery — pre-congress course — Asociación Médica Argentina · Buenos Aires, 12 de octubre de 2006
- Speaker: surgical treatment of skin tumors — Jornada de Alergia, Dermatología y Cirugía Estética · BUAP, noviembre de 1996
Trust is verified, not promised. All 210 scanned documents —degree, licences, diplomas, publications and certificates, from 1977 to 2025— are open in Dr. Arístides Arellano’s credential archive, alongside an explanation of the difference between a specialty licence and a board certification.
Recovery · step by step
- Day 1Mild discomfort controlled with simple analgesia. Normal life; the wound is kept dry.
- Days 2–7Dressing changes as advised. Strain that stretches the operated area is avoided.
- Days 7–14Sutures removed. The histopathology result is delivered and explained.
- Weeks 3–4Full return to exercise. Scar care begins (silicone, sun protection).
- Months 3–12The scar matures, lightens and flattens progressively.
Frequently asked questions
Is a sebaceous cyst dangerous — is it cancer?
No. A sebaceous (epidermoid) cyst is benign and malignant transformation is extraordinarily rare. Even so, the excised specimen is sent for histopathology to confirm the diagnosis — that is the standard, not a formality.
Can I squeeze or drain the cyst myself?
No. Squeezing pushes the contents into the surrounding tissue and inflames the area, and draining only empties the sac: the capsule stays behind and the cyst refills, now with more fibrosis and infection risk. The definitive solution is complete excision.
Why did my cyst come back after it was drained?
Because drainage removes the contents but leaves the capsule, which is what produces the material. As long as the capsule remains, the cyst can refill. Complete excision with the capsule intact is what breaks the cycle.
Does sebaceous cyst surgery hurt?
It is done under local anaesthesia: you feel the initial sting and then pressure, not pain. Discomfort afterwards is usually mild and controlled with simple analgesics for a day or two.
How long does the surgery take?
20 to 40 minutes in most cases, as an outpatient office procedure. Large, multiple or previously infected cysts can take longer.
What if the cyst is inflamed or infected?
The episode is controlled first with antibiotics and, if there is an abscess, drainage. Operating on a “hot” cyst ruptures the capsule and favours recurrence, so definitive excision is scheduled a few weeks later, once the tissues have settled.
What scar does sebaceous cyst removal leave?
A fine line the length of the incision, planned along the skin’s natural lines or inside a crease. On the face and ears, layered tension-free closure is what decides the result. With proper postoperative care it tends to fade over the months. Results may vary.
How much does sebaceous cyst removal cost in Puebla?
It depends on size, location, the number of lesions and whether the cyst has been inflamed before, since that makes surgery more laborious. At the consultation you receive a clear written quote, including histopathology, before anything is scheduled.
Can a sebaceous cyst be removed with a laser alone?
Not definitively. A laser can open and drain it, but if the whole capsule is not removed the cyst fills again. The CO₂ laser is used as a scalpel to make the incision with less bleeding; removing the capsule is still surgical.
Every case is different. Discuss yours in a personal consultation.
Book a consultation on WhatsAppEvery figure published on this site is approximate and is not a quote. Any procedure or treatment first requires a private assessment consultation with Dr. Arístides Arellano —$800 MXN, charged separately— and it is at that consultation that the definitive cost of your case is determined.
Educational content; it does not replace a medical consultation. Results may vary from person to person.