Sebaceous cysts are benign, slow-growing lumps that develop beneath the skin. Although commonly referred to as "sebaceous cysts", many are technically epidermoid cysts that arise when keratin becomes trapped beneath the skin after a blocked hair follicle.
These cysts can develop almost anywhere on the body but are most frequently found on the scalp, face, neck, back and trunk. They often grow slowly and may remain painless for long periods.
They are more commonly seen in adults and tend to occur most frequently between the ages of 30 and 40 years old. They are also observed more often in men than in women. While usually harmless, some cysts may gradually enlarge, become infected or cause cosmetic concerns that prompt medical evaluation.
Sebaceous cysts usually form when material that would normally be shed from the skin becomes trapped beneath the surface. Over time, this material accumulates and forms a cyst lined by a thin sac.
These benign growths often enlarge gradually over months or years and may remain unchanged for long periods.
Some of the common features include:
Many patients initially mistake a sebaceous cyst for a pimple, boil or fatty lump. Although these conditions can appear similar, they arise from different tissues and may require different treatment approaches.
FEATURE | SEBACEOUS CYST | ACNE CYST | LIPOMA |
Origin | Trapped skin cells or keratin | Inflamed oil gland and hair follicle | Fat tissue beneath the skin |
Texture | Firm or slightly movable | Tender and inflamed | Soft and doughy |
Growth pattern | Slow-growing | Often develops rapidly during flare-ups | Slowly enlarges over time |
Central opening | May have a visible punctum | Usually absent | Absent |
Pain | Usually painless unless infected | Often painful | Usually painless |
Treatment | Observation or removal | Acne treatment | Surgical removal (link to lipoma removal) if symptomatic |
The vast majority of sebaceous cysts are benign and remain non-cancerous throughout life. However, not every lump beneath the skin is a sebaceous cyst. Lipomas, enlarged lymph nodes, abscesses and, less commonly, skin or soft tissue cancers can sometimes appear similar.
A medical assessment is recommended to confirm the diagnosis, particularly if a lump:
A sebaceous cyst may occasionally rupture, releasing keratin and cyst contents into the surrounding tissue. When this occurs, the body often reacts with significant inflammation.
Signs of a ruptured cyst may include:
Medical review is recommended because a ruptured cyst may increase the risk of:
Attempting to squeeze or pop a ruptured cyst yourself may worsen inflammation or increase the risk of infection.
Sebaceous cysts can generally be diagnosed during a specialist consultation without extensive testing. The primary goal is to confirm the diagnosis and distinguish the cyst from other skin or soft tissue lumps.
Assessment may include:
The consultation begins with a discussion about:
The lump is carefully examined to assess:
This is occasionally recommended when the diagnosis is uncertain, the lump is unusually large or deeper soft tissue involvement needs further evaluation
Many sebaceous cysts are harmless and may simply be monitored if they remain small and symptom-free. However, treatment may be considered when a cyst enlarges, becomes infected, causes discomfort, recurs repeatedly or creates cosmetic concerns.
Treatment options include:
Small, asymptomatic cysts may not require immediate treatment. Regular monitoring may be appropriate if the diagnosis is clear and the cyst remains stable.
Complete removal of the cyst together with its capsule (cyst wall) is generally considered the most definitive treatment.
During the procedure:
Removing the entire cyst wall helps minimise the likelihood of recurrence and provides tissue for pathological examination when indicated.
When a cyst becomes infected or develops into an abscess, immediate drainage may be required to relieve pain and reduce inflammation.
This procedure involves:
Because the cyst lining often remains behind, recurrence may still occur unless definitive excision is performed later.
Recovery milestone | Typical timeframe |
Return home | Usually discharged on the same day |
Normal daily activities | 1–3 days |
Wound healing | 1–2 weeks |
Scar maturation | Several months |
For patients travelling from the Philippines, sebaceous cyst removal is usually performed as a day procedure. Depending on the size and location of the cyst, many patients travelling from the Philippines are able to fly home within a few days, provided the wound is healing well and their surgeon considers it safe to travel.
For patients travelling from the Philippines, evaluation can often begin before arrival through an online consultation.
During the teleconsultation, Dr Aaron Poh can review:
To prepare for your consultation, it may be helpful to provide:
Our team can help coordinate consultations, investigations and treatment scheduling within your planned travel period.
For some patients from the Philippines, the main concern is not simply the presence of a lump but uncertainty about what it represents and whether treatment is necessary.
At Alpine Surgical Practice, Dr Aaron Poh carefully evaluates the lump, reviews any previous treatments and determines whether the lesion is consistent with a sebaceous cyst or another condition requiring further assessment.
Where appropriate, removal can be planned to address recurrent infection, discomfort, enlargement or cosmetic concerns.
If you have a persistent lump beneath the skin, arranging an appointment may help provide diagnostic clarity and guidance regarding the most appropriate treatment options.
Sebaceous cysts often appear as a slow-growing lump beneath the skin. Many remain painless, but symptoms may develop if the cyst enlarges, becomes inflamed or becomes infected.
Common symptoms include:
No, attempting to squeeze or puncture a sebaceous cyst is generally not recommended.
Doing so may:
Not all sebaceous cysts require treatment. However, removal may be recommended when the cyst:
Dr Aaron Poh is a fully accredited General Surgeon with dual subspecialties in Colorectal Surgery and Trauma Surgery, recognised by Singapore’s Specialist Accreditation Board and Ministry of Health. He is the Medical Director of Alpine Surgical Practice, with clinics located at Mount Elizabeth Hospital, Parkway East Hospital, and Farrer Park Hospitals.
Dr Aaron Poh has extensive experience, having performed over 5,000 endoscopic procedures. He is a strong advocate for early detection through colonoscopy, particularly for individuals at risk of colorectal cancer. His expertise includes advanced endoscopic techniques such as Endoscopic Mucosal Resection (EMR) for complex polyps and colonic stenting for obstructed cancers, which help patients avoid major emergency surgery.
When surgery is required, he specialises in minimally invasive laparoscopic colorectal cancer surgery, offering patients faster recovery with less pain and scarring. In addition to cancer care, he manages a wide range of anal conditions including haemorrhoids, fistulas, fissures, and abscesses, providing comprehensive colorectal treatment.
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