Glomus Tumor

Overview

A glomus tumor is a small growth that usually develops from glomus cells. Glomus cells are special cells found in the walls of tiny blood vessels in the skin. They help control blood flow and body temperature. When these cells grow too much, they can form a small lump. Most glomus tumors are benign, which means they are not cancer and do not spread to other parts of the body. They most often appear under a fingernail or toenail, or just under the skin of a finger or toe, and they are famous for causing sharp, intense pain.

Glomus tumors are uncommon. Most general practice doctors will see only a handful in their whole career, so it can take a while to get the right diagnosis.

They can affect anyone at any age, including children. They are most often found in adults between about 20 and 40 years old, and slightly more often in women. Most people have a single tumor. Rarely, some people develop several at once, and some of these multiple forms run in families.

Symptoms

Common symptoms

• Sharp, severe pain in a finger or toe, often felt as a pinpoint spot of pain
• Pain that is triggered by cold, for example when washing hands in cold water or reaching into a fridge
• Pain when the small area is pressed, even lightly
• A small lump or bump you can feel under the skin or under the nail
• A small bluish or reddish spot visible under the nail
• Swelling or a changed shape of the fingertip or nail
• The nail may look different, such as a groove or a split
• Pain that wakes you at night or makes you avoid using that hand or foot

Symptoms in children

• Children may not be able to explain the pain, so they may simply cry when the hand or foot is touched
• A child may avoid using that hand, or refuse to hold things with it
• The lump can be very small and easy to miss, especially under a nail
• It may be mistaken for a injury, a splinter, or a nail infection
• Children with a painful finger or toe should still be checked by a doctor

Symptoms in older adults

• The pattern of pain is usually the same as in younger adults
• Pain may be put down to arthritis or circulation problems at first, which can delay the diagnosis
• Skin and nails change with age, so a small lump can be harder to see
• If you take blood-thinning medicines, tell your doctor before any procedure

Causes

Main causes

• An overgrowth of glomus cells, which are normal cells found around tiny blood vessels in the skin
• In most people the exact reason this happens is not known
• A small number of cases are linked to changes in a gene that can run in families, especially when several tumors appear

Risk factors

• Being between about 20 and 40 years old
• Being female, which is slightly more common
• A family history of multiple glomus tumors, which is rare
• Having one glomus tumor slightly raises the chance of another appearing later, but this is uncommon

When to see a doctor

See a doctor urgently if:

• The finger or toe suddenly changes color, feels cold or goes numb
• There are signs of infection such as spreading redness, heat, pus or a fever
• The lump is growing quickly or bleeding
• The pain is severe and uncontrolled, or you cannot use your hand or foot

Book a routine appointment if:

• You have a small, long-lasting spot of pain in a finger or toe that you can point to with one finger
• Cold water or cold air reliably triggers sharp pain in a finger or toe
• You can feel a small lump under the skin or notice a spot or groove under a nail
• The pain has lasted more than a few weeks or keeps coming back
• A child keeps crying or pulling away when a certain finger or toe is touched

Diagnosis

A doctor will start by asking about your pain, what triggers it and how long it has been there. They will look closely at the finger or toe and gently press on the spot. Finding one very tender point, and pain when the area is cooled, strongly suggests a glomus tumor. Because the lumps are so small, imaging scans are often used to confirm the spot and show exactly where it is before any treatment.

Tests that may be done

• A careful physical exam, including gentle pressure on the tender spot
• A cold sensitivity check, where the doctor sees whether cold triggers the pain
• A light test: shining a light through the fingertip can sometimes show the small lump as a shadow
• Ultrasound scan of the finger or toe
• MRI scan, which gives a detailed picture of small lumps
• A tissue sample (biopsy) is usually only taken when the lump is removed, to confirm what it is

What to expect at your appointment

You may be referred to a hand specialist or a skin specialist. Diagnosis can take time because the lumps are tiny and the pain can be mistaken for other problems. Keep noting what triggers the pain, such as cold or pressure, as this helps your doctor. Most tests are quick and painless, and you can usually go home the same day.

Treatment

The main treatment is a small operation to remove the tumor, which usually stops the pain completely. If the tumor is very small, mild, or in a spot that is hard to operate on, your doctor may first suggest watching it and managing the pain. Your healthcare team will talk through the options with you, including the benefits and risks of each.

Self-care at home

• Keep a simple diary of when the pain happens, how long it lasts, and whether cold or pressure sets it off
• Protect the finger or toe from knocks and from very cold water, for example by wearing gloves
• Avoid pressing or squeezing the lump to test it, as this can make the pain worse
• Take over-the-counter pain relief only as advised by your doctor or pharmacist, and tell them about any other medicines you take
• Attend follow-up appointments so the spot can be checked

Medical treatments

If removal is not possible straight away, or the tumor is very small, your care team may suggest ways to control the pain while you decide. These can include pain-relieving medicines recommended by your doctor, protecting the area from cold, and in some cases treatments given by a specialist such as injections into the spot, freezing, or laser treatment. Which option suits you depends on the size and position of the tumor and your general health. Your doctor or pharmacist can explain what is safe for you.

When is surgery considered?

Surgery is usually recommended when the pain is frequent or severe, when the diagnosis is uncertain, or when the lump is growing. The operation is usually done under local anaesthetic, which means the area is numbed and you stay awake. The surgeon makes a small cut, often near or under the nail, and removes the tumor. It is a minor procedure but needs a skilled hand, so it is often done by a hand or skin specialist. Recovery is usually quick, though the nail may take several months to grow back normally.

Living with this condition

Many people find the pain is the hardest part, especially because cold and light knocks can set it off. Simple changes, like wearing gloves for cold tasks and being careful when gripping or lifting, can make daily life easier. If you are waiting for treatment, plan tasks that need fine finger work for times when the pain is quieter.

Lifestyle tips

• Wear gloves in cold weather and for chores like washing up or reaching into the freezer
• Avoid repetitive pressure on the affected finger or toe where you can
• Keep your nails trimmed and avoid tight shoes if the tumor is on a toe
• Tell your dentist, hairdresser or anyone else who might grip your hand that the area is tender
• Stop smoking if you smoke, as it helps blood flow and healing, especially before surgery

Diet and exercise

There is no special diet that treats a glomus tumor. Eating a balanced diet and staying active support your general health and help recovery after surgery. Choose exercise that does not put direct pressure on the tender spot, such as walking, swimming or cycling, and follow your surgeon's advice about when to return to heavier activity.

Mental health and emotional wellbeing

Ongoing pain that no one can easily see can be tiring and upsetting. It is common to feel frustrated, worried, or low in mood, especially if diagnosis takes time. These feelings are valid. Talk to your doctor about the emotional side as well as the physical pain, and ask what support is available. If you ever feel hopeless or have thoughts of harming yourself, contact your local emergency number or a crisis support line in your country straight away, and reach out to someone you trust.

Prevention

In most cases, a glomus tumor cannot be prevented, because it comes from cells that grow in a way we cannot yet control. There is no proven way to reduce the risk.

Screening programmes

Routine screening is not recommended. If you have a family history of multiple glomus tumors, mention it to your doctor so they can advise whether any checks are needed.

Complications

If left untreated

• The pain may continue or get worse over time, affecting sleep and daily activities
• The tumor may slowly grow larger, which can make surgery more difficult later
• The nail can become deformed, split or grooved
• Rarely, a glomus tumor can be malignant (cancerous), and this is more likely if it grows quickly
• Ongoing pain can affect mood, work and sleep

Long-term outlook

The outlook is generally very good. Most glomus tumors are benign, and removing them usually stops the pain completely. Some people need a little time for the nail to recover, and a small number of tumors come back, so follow-up checks are sensible. If a tumor does return, it can usually be treated again. Talk to your healthcare team about what to expect in your own case.

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