Quick answer. A lipoma is a common, benign lump of fatty tissue under the skin that is typically soft, movable and painless. It is almost always harmless, but a hard, fixed, rapidly growing or painful lump should be checked by a doctor to exclude rarer conditions.
A lipoma is a soft lump of fatty tissue that grows slowly just under the skin. Finding any new lump can be unsettling, but a lipoma is benign, it is one of the most common soft-tissue lumps and is not cancer. Lipomas are typically soft, easy to move under the skin with light pressure, and painless, and many people have one or more without ever needing treatment.
This guide explains what a lipoma is, how to recognise it, why it forms and how it is diagnosed and managed. Just as importantly, it sets out the warning features that should prompt a check with a doctor, so a rarer condition such as a soft-tissue sarcoma can be excluded. The aim is to reassure you about typical lipomas while being clear about when a lump deserves prompt attention.
At a glance
| Feature | Typical lipoma (reassuring) | When to worry |
|---|---|---|
| Texture | Soft and doughy | Hard or firm to the touch |
| Mobility | Moves easily under the skin | Fixed or tethered to deeper tissue |
| Growth | Stays the same or grows very slowly | Rapidly growing or larger than about 5cm |
| Pain | Usually painless | Painful or tender |
| Depth | Sits just under the skin | Feels deep within muscle |
What is a lipoma?
A lipoma is a benign growth made up of fat cells that develops in the layer of tissue just beneath the skin. It usually feels like a soft, rubbery lump that moves slightly when you press it. Lipomas can appear almost anywhere on the body but are common on the shoulders, neck, back, arms and thighs.
Lipomas are very common and most often appear in adults between the ages of forty and sixty, though they can develop at any age. A person may have a single lipoma or several. The reassuring point is that lipomas are not cancer and generally cause no harm, often needing no treatment at all unless they become bothersome.
Symptoms & signs
Lipomas have a characteristic feel that helps distinguish them from more concerning lumps. Typical features include:
- A soft, doughy lump that moves easily under the skin with light finger pressure
- Slow growth, often staying the same size for years
- Usually painless, though one can be uncomfortable if it presses on a nerve
- Generally small, commonly under a few centimetres, and sitting just below the skin
- Skin over the lump looks normal
If a lump has all these reassuring features, it is very likely to be a harmless lipoma, but a doctor can confirm this.
Causes & risk factors
The exact reason lipomas form is not fully understood. They arise from an overgrowth of fat cells, and there is often a family tendency, suggesting genetics play a part. They are not caused by anything you have done wrong and are not contagious.
Factors that may be associated with lipomas include a family history of them, being between forty and sixty years old, and certain inherited conditions that cause multiple lipomas to develop. Some people simply seem more prone to them. Having a lipoma does not increase your risk of cancer, and lipomas themselves do not turn into cancer.
How it is diagnosed
A doctor can usually identify a lipoma from its soft, movable feel and slow growth during a physical examination. In many cases no further tests are needed. However, if there is any doubt, or if the lump has worrying features, a doctor may arrange:
- An ultrasound scan to look at the lump’s structure
- An MRI scan for deeper or larger lumps, to see them in more detail
- A biopsy, where a sample of the lump is examined under a microscope, if there is any concern about the diagnosis
These tests help confirm that a lump is a benign lipoma and, importantly, help exclude rarer conditions such as a soft-tissue sarcoma when the features are not typical.
Treatment options
Because lipomas are harmless, most do not need any treatment, and reassurance that the lump is benign is often all that is required. Treatment is generally considered only when a lipoma is bothersome. Options include:
- Leaving it alone: the usual approach for a typical, painless lipoma that is not growing
- Surgical removal: a minor procedure to excise the lipoma, considered if it is painful, growing, large, cosmetically unwanted, or the diagnosis needs confirming
Removal is usually straightforward and recurrence at the same site is uncommon. Your doctor will discuss whether removal is worthwhile based on the lump’s size, location and how much it bothers you.
When to see a doctor & which specialist
Most lipomas are harmless, but it is wise to have any new or changing lump assessed so you can be reassured and so that rarer conditions are not missed. See a doctor promptly if a lump:
- Feels hard or firm rather than soft
- Is fixed to deeper tissue and does not move easily
- Is growing quickly or is larger than about 5cm
- Is painful or tender
- Feels deep within muscle rather than just under the skin
These features do not mean you have cancer, but they are exactly the signs that prompt a doctor to investigate further and exclude a soft-tissue sarcoma. For assessment of a skin or soft-tissue lump, a dermatologist can help, while a deep or suspicious lump may be referred onward. Find a specialist through our directory of dermatologists in Singapore.
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Sources
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