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PubMed This is a summary of 23 peer-reviewed journal articles Updated

How Common Are Lipomas in Adults, and Should I Worry?

At a Glance

Lipomas are very common, usually harmless fatty lumps that grow slowly and move under the skin. Because other masses can look similar, every new or changing lump should be examined—especially if it is larger than 5 cm, deep, firm, painful, fixed, or growing quickly.

Lipomas are among the most common non-cancerous (benign) soft-tissue growths in adults [1][2]. It is sometimes stated in medical literature that they affect about 1% to 2% of the population [3]. However, exact prevalence estimates for the general population are limited, and figures can vary depending on the group studied [4][5]. For example, one community survey found a self-reported rate of about 4%, though self-reported cases are not always medically verified [4]. The important takeaway is that while exact numbers are hard to pin down, lipomas are very common.

Once a clinician has confirmed that a lump is a typical lipoma, it is usually harmless. A typical lipoma feels like a soft, doughy lump just under the skin. It moves easily when you press on it and grows very slowly [6][7]. Many people live with lipomas for years without ever needing them treated or removed. However, benign lipomas can sometimes cause pain, particularly if they grow large enough to press on nearby nerves or other structures [8][9].

When to Get a Lump Checked

Even though lipomas are common, you should never assume a new lump is a lipoma without having it checked. Just because these growths are frequent does not mean every lump is harmless [10]. It is very difficult to tell for certain what a lump is just by feeling it [11].

You should have a doctor examine any new or changing lump, especially if it shows “red flag” signs. A small, stable, superficial lump without concerning features can usually be assessed through a routine appointment. However, prompt or expedited assessment is recommended if a lump:

  • Is larger than 2 inches (5 cm) across [10]
  • Grows rapidly or changes shape [10]
  • Feels firm, hard, or fixed in place (does not move easily) [6]
  • Causes new or persistent pain or discomfort [10][8]
  • Is located deep beneath the skin (under the fascia, the connective-tissue layer around muscles) [10][11]
  • Comes back after being removed [12]

What Usually Happens Next

To evaluate a lump, a clinician will first perform a physical exam. For a classic, small, superficial lipoma, they may recommend observation without further testing. If there is any uncertainty, an imaging test such as an ultrasound (which uses sound waves) is often the first step to check the lump’s size and depth [13].

For lumps that are larger than 5 cm, located deep in the tissue, or growing rapidly, an MRI (Magnetic Resonance Imaging) is typically arranged [14][15]. MRIs provide highly detailed pictures that help doctors see the structure of the lump. While a typical superficial lipoma may not need a biopsy, imaging cannot always establish the diagnosis by itself [16][17]. If a lump remains indeterminate, a small tissue sample (biopsy) may be needed to confirm the diagnosis [16][15].

Rarely, a mass that resembles a lipoma—particularly one that is deep, enlarging, large, or otherwise atypical—may instead be a different type of fatty tumor, such as a well-differentiated liposarcoma [18][19]. An ordinary lipoma does not typically transform into cancer; rather, a liposarcoma is a separate condition that can look like a lipoma initially [18]. This is why suspicious, deep, or large masses should be referred to an appropriate specialist team for evaluation before any biopsy or removal is attempted [10][20]. An unplanned excision or poorly placed biopsy can complicate later definitive surgery [21][22].

Monitoring and Treatment

While waiting for an appointment or if your doctor recommends observing the lump, you can monitor it by noting when you first noticed it, its approximate size and location, whether it is growing, and whether it causes pain or affects movement.

Many confirmed lipomas need no treatment. Removal may be considered for pain, functional or cosmetic concerns, growth, or diagnostic uncertainty [23][8].

Common questions in this guide

How common are lipomas in adults?
Lipomas are among the most common noncancerous soft-tissue growths in adults. Estimates vary because studies use different methods, but they are generally considered very common; commonly cited figures are about 1% to 2% of people.
Are lipomas usually something to worry about?
A typical lipoma that has been confirmed by a clinician is usually harmless. It is often soft, movable, and slow-growing, and many people never need treatment. However, a new lump should not be assumed to be a lipoma without an examination.
What changes in a lump mean I should seek medical care?
Arrange prompt assessment if a lump is larger than 5 cm, growing quickly, changing shape, firm or fixed, persistently painful, deep under the skin, or has returned after removal. A small, stable, superficial lump without concerning features can often be assessed at a routine appointment, but it still should be checked if it is new.
How will a doctor check whether a lump is a lipoma?
A clinician usually starts with a physical examination. A classic small lump near the skin may only need observation, while an ultrasound can assess size and depth when there is uncertainty. MRI is often used for larger, deep, or fast-growing lumps, and a biopsy may be needed if imaging cannot establish the diagnosis.
Can a lipoma turn into cancer?
An ordinary lipoma does not typically change into cancer. A separate fatty tumor called a well-differentiated liposarcoma can sometimes look like a lipoma, especially when a mass is deep, large, enlarging, or atypical. Those features should be assessed by an appropriate specialist team before biopsy or removal.
Do all lipomas need to be removed?
No. Many confirmed lipomas can simply be observed if they are not causing problems. Removal may be considered when a lipoma is painful, affects movement or daily activities, causes cosmetic concern, grows, or remains uncertain after evaluation.

Related questions

Why Is There Still a Lump After Lipoma Removal Surgery? Can a Lipoma Be Drained, or Does It Need to Be Removed? Will a Lipoma Go Away or Shrink Without Treatment? Can New Lipomas Appear After One Is Removed? Key Facts Can an Injury or Bump Cause a Lipoma to Form? What to Know
Show more
Can Weight Loss, Diet, or Exercise Shrink a Lipoma? Do Fat-Dissolving Injections Work for Lipomas? Risks How Can I Safely Tell a Lipoma From an Epidermoid Cyst? What Does a Positive MDM2 Test Mean for a Lipoma or Lump? What Is Lipoma Removal Surgery Like? Anesthesia and Incision Will Lipoma Removal Leave a Scar? How Noticeable Is It?

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References

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This page is for informational purposes only and does not constitute medical advice. A clinician should assess any new or changing lump, especially one that is large, deep, painful, firm, fixed, or growing quickly.