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CION Cancer Clinics
Head size, skin signs and PTEN: what doctors look for | CION Cancer Clinics
A larger head and a handful of small skin bumps are often the first visible clues that a family carries a PTEN fault. None of these signs is harmful in itself. Together, they can point a doctor towards testing years before any cancer would appear. This page explains which signs matter, how a doctor checks for them, and why one sign on its own rarely means anything. 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
- Which body signs can point to a PTEN fault?
- What do the physical signs of PTEN look like?
- How does a doctor check for these signs?
- What do the medical words for these signs mean?
- When is a sign worth mentioning, and when is it just common?
- What this page cannot tell you
- Four things families believe about these signs, and what is true
- Common questions about the physical signs of PTEN
The short answer
Which body signs can point to a PTEN fault?
The two signs doctors look for most are a head that is larger than expected for age, and certain small bumps on the face, hands, feet and inside the mouth. They are harmless in themselves. What makes them useful is that they can be seen, often from childhood, while the cancer risks that come with PTEN sit much later in life.
Why a skin sign can matter more than a scan
A PTEN fault causes small, harmless overgrowths in many tissues. Doctors call these hamartomas. In the skin they show up as tiny bumps that most people never notice, or dismiss as warts. A dermatologist who recognises the pattern can raise the question of PTEN long before a thyroid or breast problem appears. That gives the family years of warning.
Why doctors look at the whole person
No single sign confirms PTEN. Doctors use scoring criteria that add up major and minor features, and they look at the family as well as the individual. A large head in a child who is otherwise well is common, and usually runs in the family for no medical reason. The same head size alongside skin bumps and a thyroid nodule tells a very different story.
These signs are clues, not a diagnosis. Only a blood test can confirm a PTEN fault.What doctors look for
What do the physical signs of PTEN look like?
Most of these are small and easy to miss. Doctors look for them together, never one at a time.
A larger head
The head measures above the expected range for age and sex on a growth chart. It is the most common physical feature in people with a PTEN fault, and is often present from birth.
Usually noticed
- At routine child health checks
- When hats and helmets never seem to fit
- Because a parent has the same head size
Small bumps on the face
Skin-coloured bumps around the nose, mouth and ears, sometimes described as warty. One type, called a trichilemmoma, is strongly linked to PTEN. It is confirmed by removing one bump and looking at it under a microscope.
Changes in the mouth, hands and feet
Tiny smooth bumps on the gums, tongue or inner lips, sometimes giving a cobblestone look. Small rough spots on the palms, the soles or the backs of the hands.
Also seen
- Soft fatty lumps under the skin
- Freckling on the penis in boys and men
- Unusual clusters of blood vessels
Development in children
Some children with a PTEN fault have delayed speech or walking, learning differences or autism. A child with a large head and autism is one of the groups doctors now think about testing.
Most autistic children do not have a PTEN fault.Not sure whether this applies to you?
Ask an oncologistAt the clinic
How does a doctor check for these signs?
Measuring the head
A soft tape goes around the widest part of the head, just above the eyebrows and ears. The measurement is plotted on a chart for age and sex. It takes under a minute and needs no preparation.
Examining the skin and mouth
The doctor looks closely at the face, hands, feet and inside the mouth in good light. Bring photographs if a bump has already been removed or has changed.
Taking a family history
The doctor asks who else has a large head, skin bumps, thyroid disease, or early breast, womb or kidney cancer. Measuring a parent's head can be surprisingly useful.
Deciding on a blood test
If enough features add up, you are referred to a genetic counsellor for PTEN testing. If they do not, you are told so plainly, and nothing further is needed.
In the clinic letter
What do the medical words for these signs mean?
- Macrocephaly
- A head size above the usual range for age and sex. In PTEN it is a feature, not an illness, and needs no treatment.
- Hamartoma
- A harmless overgrowth of tissue that normally belongs in that place. PTEN faults cause these in the skin, gut, thyroid and elsewhere.
- Trichilemmoma
- A small skin bump that grows from the root of a hair. Several on the face are one of the stronger clues to PTEN.
- Papilloma
- A small raised bump on the skin or in the mouth. Common in everyone, but many together in the mouth raise the question.
- Keratosis
- A small, rough, thickened patch of skin, often on the palms or soles.
- PTEN hamartoma tumour syndrome
- The umbrella name for every condition caused by a PTEN fault, including Cowden syndrome.
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Side by side
When is a sign worth mentioning, and when is it just common?
Common on its own
Worth raising with a doctor
One or two skin tags on the neck
Many small bumps on the face or in the mouth
A large head that runs in the family, with nothing else
A large head with skin bumps or thyroid nodules
A single fatty lump
Fatty lumps alongside other PTEN features
One thyroid nodule found in later life
Thyroid nodules or thyroid cancer at a young age
Autism in a child with a typical head size
Autism or delayed development with a large head
Being straight with you
What this page cannot tell you
It cannot tell you whether a bump on your own skin is a PTEN sign. Many harmless skin changes look alike, and some need to be removed and examined under a microscope before anyone can say what they are. A dermatologist or clinical geneticist who can see the skin is the right person to judge.
It cannot score your features for you
The criteria doctors use are detailed, and they change as evidence grows. Adding up signs from a website can leave you more worried than you need to be, or wrongly reassured. What a particular combination means is a question for the counsellor or geneticist who examines you, and what a specific variant means is a question for the counsellor who ordered the test.
Who this does not apply to
Most people with a large head, a few skin tags or a single thyroid nodule do not have a PTEN fault. These features are all common in the general population. Testing is considered when several appear together, or when a relative is already known to carry the fault. If that is not you, you almost certainly do not need this test.
Commonly believed
Four things families believe about these signs, and what is true
"A big head means something is wrong with the brain."
In PTEN, a large head is usually just a large head, and it rarely causes problems itself. Your doctor may still arrange a check if there are other signs, such as new headaches or unsteadiness.
"The skin bumps will turn into skin cancer."
The typical bumps are harmless and stay that way. A yearly skin check is still advised for PTEN carriers, because the risk of melanoma is raised separately.
"If I cannot see any signs, I cannot carry the fault."
Signs vary widely, even within one family. Some carriers have very few, especially children and young adults, whose skin signs may not have appeared yet.
"Removing the bumps removes the risk."
Bumps can be removed if they bother you, and one may be removed to confirm the diagnosis. The gene fault is in every cell, so the cancer risks elsewhere in the body stay the same.
Questions we are asked
Common questions about the physical signs of PTEN
Does a large head in my child mean they have PTEN?
Usually not. Many healthy children have a large head, often because a parent does too. Doctors think about PTEN when a large head comes with other features, such as delayed development, autism, skin bumps or unusual freckling. Your paediatrician can measure both parents and plot the results before deciding whether a referral is worth making.
At what age do the skin signs usually appear?
Head size is often noticeable from infancy. The skin bumps on the face and hands tend to appear later, commonly by early adult life, though timing varies a great deal. This is one reason a child with a PTEN fault can look entirely unremarkable apart from the size of their head.
Should the bumps be removed?
Only if they are uncomfortable, bleed, or bother you because of how they look. A dermatologist may remove one to confirm its type under a microscope. Many people leave them alone. Removing them does not change the cancer risks linked to the gene.
Can a skin biopsy diagnose PTEN?
A skin sample can show that a bump is a trichilemmoma, which is a strong clue. It cannot confirm the gene fault itself. Only a blood test, arranged through a genetic counsellor, can do that, and the counsellor will explain what the result means for the rest of the family.
Do these signs mean I already have cancer?
No. The physical signs of PTEN are harmless overgrowths. They are useful because they flag a raised future risk of some cancers, which can then be watched for with planned checks. Spotting them early is an advantage, not a diagnosis.
My father has a large head and thyroid problems. Should I be tested?
It is worth describing that pattern to a doctor. The usual first step is for your father to be examined and, if the features add up, tested first. If he carries a PTEN fault, you can then be offered a simpler test for that exact change.
Which doctor should we see first?
A dermatologist for skin changes, a paediatrician for a child's head size or development, or your oncologist if there is already a cancer in the family. Any of them can refer you to a genetic counsellor if the signs point towards PTEN.
Can CION help us decide whether to test?
Yes. Call the CION helpline and describe the signs and the family history. Someone will tell you honestly whether a genetic referral is worth making, and arrange a counselling appointment if it is. Counselling can be offered in Telugu.
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
- GeneReviews (NCBI) — PTEN Hamartoma Tumor Syndrome
- MedlinePlus Genetics — Cowden syndrome
- MedlinePlus Genetics — PTEN gene
- NCCN — Genetic/Familial High-Risk Assessment: Breast, Ovarian, Pancreatic, and Prostate
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
PTEN hamartoma tumour syndrome: the umbrella termHow Cowden syndrome and related names fit togetherThe PTEN gene: what it doesWhy one gene causes overgrowths in so many tissuesTesting the family for PTENWho should be tested first, and in what orderSurveillance for PTEN carriersThe checks that follow a confirmed result
Talk to us
Wondering whether these signs fit your family?
Describe the signs and the family history to us. We will tell you honestly whether a genetic referral is worth making, and arrange it in Telugu if you prefer. One helpline serves every CION centre.