Quick answer. Most lumps under the skin are harmless, such as lipomas (soft fatty lumps), cysts and swollen lymph nodes from infection. The biggest red flag is a lump that grows quickly, feels hard or fixed, has an irregular shape, bleeds or ulcerates, or comes with weight loss and night sweats, which should be checked promptly to exclude cancer.
Finding a new lump under the skin is understandably worrying, but the great majority turn out to be benign. Lipomas, cysts and swollen glands are extremely common and rarely dangerous. Knowing the difference between a harmless bump and a concerning one helps you decide how urgently to act.
In Singapore, you can have a skin lump assessed at a GP clinic or by a dermatologist, who can examine it and, if needed, arrange a scan or biopsy. This guide covers the common causes, how to tell benign from worrying lumps, and when to seek care.
At a glance
| Type of lump | How it usually feels | What it usually means |
|---|---|---|
| Lipoma | Soft, rubbery, moves easily, slow-growing, painless | Harmless fatty lump; remove only if bothersome |
| Sebaceous / epidermoid cyst | Smooth, round, may have a central pore, can discharge | Benign; treat if infected or unsightly |
| Swollen lymph node | Firm, tender, in neck, armpit or groin, near an infection | Often reacts to infection; settles in weeks |
| Abscess | Red, hot, painful, swollen, may have pus, with fever | Infection needing prompt treatment |
| Concerning lump | Hard, fixed, irregular, growing fast, bleeding or ulcerating | See a doctor soon to exclude cancer |
Red flags: when to seek urgent care
See a doctor soon if a lump under your skin:
- Is growing rapidly over weeks
- Feels hard, fixed to deeper tissue, or has an irregular shape
- Is bleeding, ulcerating or has a non-healing skin change over it
- Comes with unexplained weight loss, night sweats or persistent tiredness
These features should be assessed promptly to rule out cancer. Seek urgent same-day care if a lump becomes red, hot, very painful and is spreading, or you develop a fever, as this can signal a serious skin infection (abscess or cellulitis) needing treatment.
Lipoma: the soft fatty lump
A lipoma is a harmless lump of fatty tissue that sits just under the skin. It feels soft and rubbery, moves easily when you press it, grows very slowly and is usually painless. Lipomas are one of the most common skin lumps and are not cancerous.
They often need no treatment. A doctor may suggest removal only if a lipoma becomes large, uncomfortable, or you want it gone for cosmetic reasons. If a lump that you thought was a lipoma starts growing quickly or becomes hard, have it reviewed.
Sebaceous and epidermoid cysts
Cysts are smooth, round lumps under the skin, often with a small central pore. They form when a hair follicle or skin gland becomes blocked, and may release a thick, cheesy material with an odour. They are benign.
A cyst usually only needs treatment if it becomes infected (red, painful, swollen) or if it bothers you. Avoid squeezing it, which can cause infection. A doctor can drain an infected cyst or remove it completely to prevent recurrence.
Swollen lymph nodes and abscesses
Lymph nodes in the neck, armpit and groin can swell and become tender when your body fights an infection, such as a sore throat or skin infection nearby. These usually settle within a few weeks as the infection clears.
An abscess is a painful, red, hot collection of pus, often with a fever, that needs prompt medical treatment to drain it and may require antibiotics. See a doctor if a lump is rapidly worsening, very painful, or if you feel unwell.
Skin cancer: how to tell benign from concerning
Most lumps are benign, but it is important to recognise concerning features. Worrying signs include a lump that is hard, fixed and does not move, grows steadily over weeks, has an irregular border, bleeds, ulcerates or fails to heal. New or changing moles, especially those that change colour, shape or size, also need review.
Lumps with associated weight loss, night sweats or persistent firm swollen glands deserve assessment. When in doubt, a dermatologist can examine the lump and, if necessary, perform a biopsy. Early diagnosis significantly improves outcomes.
Which specialist should you see?
A GP can assess most skin lumps and refer you if needed. See a dermatologist if a lump is growing, hard or fixed, irregular, bleeding or ulcerating, if a mole is changing, or if you simply want a benign lump removed neatly. Browse our list of best dermatologists in Singapore to arrange an assessment.
What to expect at the appointment
Most assessments start with a few questions: when you first noticed the lump, whether it has changed in size, whether it is painful, and any other symptoms such as fever, weight loss or night sweats. The doctor will examine the lump, feeling its size, firmness, whether it moves freely or is fixed, and checking nearby lymph nodes. Many lumps can be diagnosed on examination alone. If needed, an ultrasound scan can show what the lump is made of, and a small sample (biopsy) or removal may be arranged if anything looks unclear or concerning. This is usually straightforward and reassuring.
Self-care and when to simply monitor
If a doctor has confirmed a lump is a harmless lipoma or a simple cyst, it is reasonable to leave it alone and watch it. Avoid squeezing or picking at cysts, as this can introduce infection. It helps to note the size, perhaps with a phone photo, so you can tell whether it is genuinely changing. Have it reviewed if it starts growing, becomes hard or painful, or the skin over it breaks down.
Common questions
Can a lump under the skin be left untreated?
Yes, if a doctor has confirmed it is benign, such as a lipoma or simple cyst, treatment is optional and often only done if it is uncomfortable or bothersome.
Will removing a lipoma or cyst leave a scar?
Removal is a minor procedure that usually leaves a small scar. A doctor can discuss the likely result and aftercare beforehand.
Do swollen glands always mean something serious?
No. Lymph nodes commonly swell and become tender when fighting a nearby infection and usually settle within a few weeks. Glands that stay enlarged, hard or painless for several weeks should be checked.
Related guides
- Best Dermatology Clinics in Singapore — our editorial shortlist
- dermatology clinics directory
- ENT specialists
- Eye specialists
- GP clinics
Sources
Part of our Skin health guides · Browse all health topics