Pathology

Symptoms, Variants, and Related Syndromes

At a Glance

Most lipomas are benign, soft, painless, and movable, but variants can be tender, firm, deep, or press on nerves. Having multiple lipomas usually does not mean a syndrome, although family patterns or pain with fatigue deserve clinical assessment.

While most lipomas fit the “classic” description of a soft, painless, and mobile lump under the skin, there are several variations. These variants are still benign (non-cancerous), but they may feel different or cause more discomfort because of their unique cellular makeup or their location deep within your body ^[1]^[2].

Most people with one conventional lipoma—or even a few—do not have a rare syndrome or cancer. The variants and syndromes below require clinical assessment.

Common Lipoma Variants

Doctors categorize lipomas based on what they look like under a microscope. Some of the most common variants include:

Angiolipoma: These are small lumps, usually found on the forearms of young adults ^[1]. Unlike standard lipomas, they contain a large number of tiny blood vessels (angio-). Because these vessels can develop tiny clots called microthrombi, angiolipomas are often tender or painful when touched ^[3]^[4].
Spindle Cell Lipoma: These typically appear as a single, firm, slow-growing mass on the back of the neck, shoulders, or upper back, most often in men between 45 and 70 ^[5]. They contain specialized spindle cells and often show a specific genetic change—the loss of the RB1 gene—which helps doctors confirm they are benign ^[5].
Hibernoma: This is a very rare variant made of “brown fat,” the type of fat used for heat production in hibernating animals ^[6]. They are usually painless and slow-growing but can sometimes be mistaken for other tumors because they have a rich blood supply ^[7].

Deep and Intramuscular Lipomas

Most lipomas are subcutaneous, meaning they sit in the fatty layer just beneath your skin. However, some grow deeper:

Intramuscular Lipomas: These grow inside or between muscle fibers ^[8]. Because they are constrained by the muscle, they may feel firmer and less “mobile” than those under the skin ^[2].
Nerve Compression: Deep-seated lipomas can sometimes press against nearby nerves or blood vessels. In one study of lipomas in the forearm, nearly half of the patients experienced symptoms of nerve compression, such as pain, tingling, or weakness ^[9]^[10]. This risk depends on your individual anatomy and the lump’s exact location.
Recurrence Risk: Because some intramuscular lipomas can be difficult to separate cleanly from muscle tissue, they are sometimes harder to remove completely. This may lead to a higher risk of the lump coming back (recurring) if any part of the growth is left behind during surgery ^[11]^[9].

Syndromes Involving Multiple Lipomas

If you have many lipomas, it might be related to a specific medical condition or a family trait. Most people with several lipomas do not automatically have a syndrome, and multiple lumps do not by themselves establish a diagnosis.

Familial Multiple Lipomatosis (FML)

FML is a clinical diagnosis where a person develops multiple, painless lipomas, typically on the trunk and limbs ^[12]. It is often passed down through families in an autosomal dominant pattern, meaning if one parent has this specific confirmed pattern, there is a 50% chance their child will as well ^[13]^[14]. While the exact genetic cause is still being studied, researchers have noted changes in the HMGA2 gene in some families, though there is no routinely available confirmatory test ^[14].

Dercum’s Disease (Adiposis Dolorosa)

This is a rare condition characterized by multiple painful fatty lumps, often accompanied by extreme fatigue ^[15]^[16]. The pain is often described as a burning or aching sensation ^[17]. It most commonly affects middle-aged women, and while the cause is unknown, it is thought to involve inflammation or a malfunction in how the body processes fat ^[18]^[19]. Because it is uncommon and has no simple confirmatory test, pain or fatigue alone should not invite self-diagnosis.

Madelung Disease (Multiple Symmetric Lipomatosis)

This rare condition involves large, symmetric deposits of fat, typically around the neck, shoulders, and upper arms ^[20]. It is often associated with long-term alcohol use, though it can occur in people who do not drink ^[21]. Unlike other lipomas, these fat deposits are not always contained in a “capsule,” which can make them more difficult to manage ^[20]. If these deposits cause swallowing, voice, breathing, or nerve-compression symptoms, they warrant prompt medical attention.

Common questions in this guide

What makes an angiolipoma different from a typical lipoma?

Angiolipomas contain many small blood vessels and can develop tiny clots, so they are more often tender or painful to touch. They commonly occur as small lumps on the forearms of young adults, while conventional lipomas are usually soft and painless.

Can an intramuscular lipoma cause nerve symptoms?

Yes. A lipoma inside or between muscle fibers can press on nearby nerves or blood vessels, causing pain, tingling, or weakness. Its exact location and relationship to surrounding tissue determine the risk and how difficult removal may be.

Does having multiple lipomas mean I have a genetic syndrome?

Not necessarily; many people with several lipomas do not have a syndrome. A family pattern of multiple, painless lipomas on the trunk and limbs may suggest familial multiple lipomatosis, but a clinician must assess the pattern, and there is no routinely available confirmatory test.

How are Dercum disease and ordinary lipomas different?

Dercum disease is a rare condition involving multiple painful fatty lumps, often with extreme fatigue and burning or aching pain. Ordinary lipomas are more often painless, and pain or fatigue alone cannot establish Dercum disease.

What is Madelung disease, and what symptoms need prompt attention?

Madelung disease causes large, symmetric fat deposits around the neck, shoulders, and upper arms, and the deposits may not be enclosed in a capsule. Trouble swallowing, voice symptoms, breathing problems, or nerve-compression symptoms should receive prompt medical attention.

Can a family history increase the chance of developing multiple lipomas?

Yes. Familial multiple lipomatosis can follow an autosomal dominant pattern, meaning a child may have a 50% chance of inheriting it when one parent has the confirmed pattern. The exact genetic cause remains under study.

Should a painful or deep lipoma be evaluated?

Yes. Pain, firmness, reduced mobility, tingling, or weakness can occur when a lipoma is a variant or lies within muscle and may press on nearby nerves. Clinical assessment is especially important for deep lumps or symptoms involving swallowing, voice, or breathing.

Get notified when new evidence is published on lipoma.

We monitor PubMed for new peer-reviewed studies on this topic and email a short summary when something meaningful changes.

References (21)

1
Angiolipoma: a review of 778 lesions in 344 patients.
Kransdorf MJ, Larsen BT, Goulding KA, et al.
Skeletal radiology 2023; (52(3)):541-552 doi:10.1007/s00256-022-04075-9.
PMID: 35668116
2
Painful Intramuscular Lipoma of the Infraspinatus: Unusual Location and Presentation.
Park HW, Jo H, Moon SH, Baek S
Orthopedics 2016; (39(2)):e370-3 doi:10.3928/01477447-20160307-03.
PMID: 26966945
3
Frequent activating PIK3CA mutations in sporadic angiolipoma.
Saggini A, Santonja C, Nájera L, et al.
Journal of cutaneous pathology 2021; (48(2)):211-216 doi:10.1111/cup.13809.
PMID: 32662895
4
Familial Angiolipomatosis: A Report of Two Cases and Review of Clinicopathologic Features, Diagnostic Considerations, and Management Challenges in an Underserved Population.
Kandula A, Rana T, Bown P, Diks J
Cureus 2026; (18(6)):e110694 doi:10.7759/cureus.110694.
PMID: 42292726
5
Spindle cell lipoma: clinicopathologic characterization of 40 cases.
Chen S, Huang H, He S, et al.
International journal of clinical and experimental pathology 2019; (12(7)):2613-2621.
PMID: 31934089
6
Spectrum of Fat-containing Soft-Tissue Masses at MR Imaging: The Common, the Uncommon, the Characteristic, and the Sometimes Confusing.
Gupta P, Potti TA, Wuertzer SD, et al.
Radiographics : a review publication of the Radiological Society of North America, Inc 2016; (36(3)):753-66 doi:10.1148/rg.2016150133.
PMID: 27163592
7
Beyond MDM2 amplification: chromosomal translocations as diagnostic drivers in adipocytic tumours-a histopathological and molecular reappraisal.
Atta IS, Shafek SI, Abdel-Hamid M
The Malaysian journal of pathology 2026; (48(1)):21-36.
PMID: 42059165
8
A "V"-Shaped Intraoral Lipoma on the Floor of the Mouth: A Case Report.
Rajaram Mohan K, Fenn SM, Pethagounder Thangavelu R, Vyapaka P
Cureus 2022; (14(10)):e30260 doi:10.7759/cureus.30260.
PMID: 36381711
9
Distribution of intramuscular giant lipomas in the functional compartments of the forearm: a report of 12 cases.
Capkin S, Cavit A, Yilmaz K, Kaleli T
Handchirurgie, Mikrochirurgie, plastische Chirurgie : Organ der Deutschsprachigen Arbeitsgemeinschaft fur Handchirurgie : Organ der Deutschsprachigen Arbeitsgemeinschaft fur Mikrochirurgie der Peripheren Nerven und Gefasse : Organ der V... 2020; (52(4)):361-367 doi:10.1055/a-0946-0453.
PMID: 31648352
10
Intramuscular Lipoma of the Thenar: A Rare Case.
Papakostas T, Tsovilis AE, Pakos EE
The archives of bone and joint surgery 2016; (4(1)):80-2.
PMID: 26894225
11
Endoscopic En-Bloc Resection of Intra-Muscular Lipoma of the Flexor Digitorum Profundus: A Uniportal Technique.
Lam PY, Lui TH
Arthroscopy techniques 2023; (12(12)):e2175-e2180 doi:10.1016/j.eats.2023.07.032.
PMID: 38196883
12
Treatment of Familial Multiple Lipomatosis: A Systematic Review.
Young K, Popova D, Mutsago T, Payne C
Clinical and experimental dermatology 2026; doi:10.1093/ced/llag252.
PMID: 42304878
13
Multiple symmetric and multiple familial lipomatosis.
Lemaitre M, Chevalier B, Jannin A, et al.
Presse medicale (Paris, France : 1983) 2021; (50(3)):104077 doi:10.1016/j.lpm.2021.104077.
PMID: 34687914
14
Clinical and Molecular Investigation of Familial Multiple Lipomatosis: Variants in the HMGA2 Gene.
Mejía Granados DM, de Baptista MB, Bonadia LC, et al.
Clinical, cosmetic and investigational dermatology 2020; (13()):1-10 doi:10.2147/CCID.S213139.
PMID: 32021365
15
Dercum's Disease: Bridging Present Understanding and Emerging Directions.
Gorini F, Coi A, Verdelli A, et al.
Life (Basel, Switzerland) 2026; (16(2)) doi:10.3390/life16020290.
PMID: 41752925
16
Dercum's disease (adiposis dolorosa): a review of clinical presentation and management.
Kucharz EJ, Kopeć-Mędrek M, Kramza J, et al.
Reumatologia 2019; (57(5)):281-287 doi:10.5114/reum.2019.89521.
PMID: 31844341
17
Differential Diagnosis of a Case of Dercum's Disease with Possible Familial Involvement and Review of Literature.
Li LZ, Kan CFK, Webb-Detiege TA
The Yale journal of biology and medicine 2021; (94(4)):603-608.
PMID: 34970098
18
The Molecular Mechanisms Underlying Dercum's Disease: Exploring the Intersection of Obesity, Pain, and Inflammation.
Reytor-González C, Jiménez-Flores E, Toral-Noristz M, et al.
International journal of molecular sciences 2025; (26(22)) doi:10.3390/ijms262211130.
PMID: 41303617
19
Infections preceding the development of Dercum disease.
Beltran K, Wadeea R, Herbst KL
IDCases 2020; (19()):e00682 doi:10.1016/j.idcr.2019.e00682.
PMID: 31908946
20
Lipomas: genetic basis of common skin lesions and their occurrence in rare diseases.
Marzyńska D, Żaba R, Lacka K
Postepy dermatologii i alergologii 2023; (40(4)):481-486 doi:10.5114/ada.2023.129529.
PMID: 37692275
21
Lipomatoses.
Dupuis H, Lemaitre M, Jannin A, et al.
Annales d'endocrinologie 2024; (85(3)):231-247 doi:10.1016/j.ando.2024.05.003.
PMID: 38871514

This page is for informational purposes only and does not constitute medical advice. A clinician should assess painful, deep, or multiple lumps and any nerve, swallowing, voice, or breathing symptoms.