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FAMMM syndrome: when melanoma and many moles run in a family | CION Cancer Clinics
Familial atypical multiple mole melanoma syndrome, usually shortened to FAMMM, describes a family where melanoma runs alongside large numbers of unusual moles. In many such families the cause is a fault in the CDKN2A gene, which also raises pancreatic cancer risk. This page explains what the name means, how it is recognised, how it can look different in Indian skin, and what families are usually offered. At CION Cancer Clinics, our oncologists explain what a gene result means for you and your family, and plan the checks that follow.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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On this page
- What is FAMMM syndrome?
- What does FAMMM look like in a family?
- How is FAMMM recognised and confirmed?
- What do the words in a FAMMM letter mean?
- How does an atypical mole differ from an ordinary one?
- What this page cannot tell you
- Four things people believe about FAMMM, and what is true
- Common questions about FAMMM syndrome
The short answer
What is FAMMM syndrome?
FAMMM is a pattern seen in a family, not a single test result. It describes families where melanoma affects one or more close relatives and where people carry large numbers of moles, some of them unusual in size, shape or colour. It is recognised by a doctor examining the skin and drawing out the family tree.
Why it has more than one name
Doctors first described these families decades ago and gave them several labels. You may see B-K mole syndrome, from the initials of the first families studied, or dysplastic naevus syndrome, from the medical word for a mole. All of them describe the same picture of many unusual moles and melanoma running together.
Where the CDKN2A gene comes in
In many FAMMM families the cause is a fault in CDKN2A, a gene that acts as a brake on cell growth. When that fault is found, the family also has a raised risk of pancreatic cancer. Some families carry a fault in a related gene called CDK4, and in others no single gene is found at all.
Many moles on their own are common. FAMMM needs melanoma in the family as well.What doctors look for
What does FAMMM look like in a family?
No single feature makes the diagnosis. It is the combination that matters.
A great many moles
Often several dozen or more, spread widely. They can appear in places the sun rarely reaches, such as the scalp, the buttocks or the soles of the feet.
Some moles look unusual
These are called atypical moles. They are not cancer, but they look different from the ordinary ones and are watched more closely.
Often
- Larger than an ordinary mole
- An uneven or blurred edge
- Mixed shades of brown, tan or pink
Melanoma in close relatives
A parent, brother, sister or child, or sometimes a grandparent, aunt or uncle. In these families melanoma often appears younger than usual, and one person may have more than one separate melanoma.
Pancreatic cancer in the same family
Melanoma and pancreatic cancer together on one side of the family points strongly towards a CDKN2A fault. Doctors sometimes call this pattern melanoma and pancreatic cancer syndrome.
Not sure whether this applies to you?
Ask an oncologistFrom first visit to answer
How is FAMMM recognised and confirmed?
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The family tree is drawn
A genetic counsellor or oncologist asks who had melanoma, pancreatic cancer or any other cancer, on both sides, and at roughly what age. Even partial answers help.
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The whole skin is examined
A skin specialist checks every area, including the scalp, soles, palms, nails and genitals. A handheld magnifying light called a dermatoscope shows detail the eye cannot.
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Suspicious moles are sampled
Any mole that looks worrying is removed or sampled and sent to the laboratory. Healthy-looking moles are left alone and photographed instead.
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The affected relative is tested first
Wherever possible, the person who had melanoma gives a blood sample for a panel that includes CDKN2A and CDK4. This shows whether there is a family fault to look for.
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Relatives are offered a plan
If a fault is found, relatives can be tested for that exact change. If none is found, relatives are still offered skin checks based on the family history.
On your report
What do the words in a FAMMM letter mean?
- Naevus
- The medical word for a mole. The plural is naevi. Most naevi are harmless and stay that way for life.
- Atypical or dysplastic naevus
- A mole that looks or grows unusually under the microscope. It is not cancer, but it marks skin that deserves regular checks.
- Dermoscopy
- Looking at a mole through a lit magnifier pressed on the skin. It is quick, painless and needs no cutting.
- Total body photography
- A set of photographs of the whole skin, kept on file. Later checks compare against them so new or changing moles stand out.
- CDKN2A
- The gene most often found in FAMMM families. A fault in it raises the risk of both melanoma and pancreatic cancer.
- Germline
- Present in every cell from birth, and able to pass to children. A gene change found only in a melanoma sample is a different finding.
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Side by side
How does an atypical mole differ from an ordinary one?
Ordinary mole
Atypical mole
Small, about the size of a pencil tip
Often larger than a pencil eraser
One even shade of brown
Mixed shades of tan, brown and pink
Round, with a smooth clear edge
Irregular, notched or blurred edge
Flat or evenly raised
A raised centre with a flat rim around it
Looks the same year after year
May change slowly, which is why photos help
Being straight with you
What this page cannot tell you
It cannot tell you whether a mole on your own skin is melanoma. Only an examination, and sometimes a biopsy, can do that. It also cannot tell you whether your family has FAMMM. That needs someone who has seen the skin and drawn out the family tree.
It cannot interpret a gene report
If a relative has already been tested, the exact change on the report matters. What your specific variant means is a question for the counsellor who ordered the test, not for a search engine.
How this looks in Indian skin
Most research on FAMMM comes from fair-skinned families in Europe, Australia and the United States. Large numbers of unusual moles are less common in darker skin, and melanoma in Indian patients more often starts on the soles, palms, under the nails or inside the mouth. Very few Indian FAMMM families have been described, so the evidence here is thin.
Who this does not apply to
Most people with many moles do not have FAMMM and do not need a gene test. Plenty of moles with no melanoma in the family is a common, ordinary finding. A dermatologist can tell you whether your skin simply needs watching.
Commonly believed
Four things people believe about FAMMM, and what is true
"Lots of moles means melanoma is on its way."
Most moles never become melanoma, and many melanomas start in new spots rather than old moles. What a high mole count tells you is who needs regular checks.
"Removing all the moles will remove the risk."
Cutting out healthy-looking moles does not prevent melanoma. The raised risk sits in the skin as a whole. Doctors remove only moles that are changing or look suspicious.
"FAMMM is only a skin problem."
When it is caused by a CDKN2A fault, the pancreas is at raised risk too. That is why carriers are often offered pancreatic surveillance as well as skin checks.
"Our skin is dark, so melanoma cannot happen to us."
Darker skin lowers the risk. It does not remove it. Check the soles, palms, nails and mouth, which are the places melanoma most often appears in Indian patients.
Questions we are asked
Common questions about FAMMM syndrome
Is FAMMM the same as having a CDKN2A fault?
Not quite. FAMMM describes what a family looks like: melanoma plus many unusual moles. A CDKN2A fault is one cause of that pattern, and the most common one found. Some FAMMM families carry a different gene, and some have no gene found at all.
How many moles counts as a lot?
There is no single number that settles it in the clinic. Many dozens of moles, especially with several unusual ones, is what raises attention. A dermatologist judges the whole picture, including where the moles are and how they look, rather than counting alone.
Can FAMMM be diagnosed without a gene test?
Yes. It is a clinical diagnosis, made from the skin and the family history. A gene test adds useful detail, such as whether pancreatic risk applies. A negative test does not cancel the need for skin checks if the family pattern is clear.
Should children with many moles be checked?
Children in a FAMMM family benefit from sun protection and from a parent watching for new or changing moles. A skin specialist can advise when formal checks should begin. Gene testing of children usually waits, because melanoma in childhood is uncommon even in these families.
Does sun protection really make a difference?
For melanoma on sun-exposed skin, yes. Avoiding sunburn and long hours in strong midday sun lowers the risk. It does not help melanoma on the soles or nails, and it does nothing for pancreatic risk, which is why checks still matter.
Who should examine the skin?
A dermatologist experienced with moles, who uses dermoscopy and ideally keeps photographs to compare over time. Seeing the same clinic each time makes changes easier to spot. CION can help you find one if you do not already have a skin specialist.
Are skin checks and gene tests covered by insurance?
Often not. Most Indian health policies cover hospital admissions rather than outpatient checks, and stand-alone gene tests are frequently excluded. Some policies with outpatient cover do pay. Check your policy wording, and ask our team for an estimate before you book.
What should the family do first?
Write down who had melanoma or pancreatic cancer, on which side, and at roughly what age. Then arrange for the relative who had melanoma to see a genetic counsellor, since testing them first gives the clearest answer. Call the CION helpline if you are not sure where to start.
Your Specialists
Meet CION's oncologists. Bring your family history or genetic report to them.
Our medical oncologists see people with a strong family history of cancer, arrange genetic counselling and testing where it fits, and plan the checks that follow.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
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Sources
- National Cancer Institute — Genetics of Skin Cancer (PDQ) – Health Professional Version
- MedlinePlus Genetics — CDKN2A gene
- MedlinePlus Genetics — Melanoma
- Cancer Research UK — Risks and causes of melanoma
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
CDKN2A mutation: which cancers and what riskHow far the gene raises melanoma and pancreatic riskThe CDKN2A gene: what it doesThe gene behind most FAMMM familiesSurveillance for CDKN2A carriersSkin and pancreas checks, and from whenMelanoma in Indian skinWhere melanoma actually appears in darker skin
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Melanoma in the family and a lot of moles?
Tell us who in your family was diagnosed and at what age. We will tell you honestly whether a skin check, a genetic referral or both make sense, and arrange them if they do. One helpline serves every CION centre.