Ganglion cyst
A ganglion cyst is a soft, mobile little ball that turns up under the skin, most often on the wrist, on a finger or on the top of the foot.
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A ganglion cyst is a soft, mobile little ball that turns up under the skin, most often on the wrist, on a finger or on the top of the foot. Inside there is neither pus nor fat but a thick, clear, jelly-like fluid: the same lubricant that fills a joint and the sheaths around tendons. It is not a tumour and it does not turn into one, and on the hand it accounts for more than half of all lumps. The story almost always ends well: some of these cysts vanish on their own within a few months or a year, and others sit unchanged for years without causing trouble. Two things make it worth understanding. First, not every lump on the wrist is a ganglion, and some of the look-alikes call for something entirely different. Second, the folk remedies for getting rid of it are precisely what cause the handful of complications it can lead to.
What it looks like and where it grows
- a smooth, rounded swelling, with the skin over it of normal colour and not stuck to it;
- it feels springy to the touch, like a blown-up ball, and rolls slightly under the fingers;
- the size ranges from a pea to several centimetres, and it changes: use makes it grow, rest makes it shrink;
- in the dark, a phone torch held against it shines through strikingly, whereas a solid tumour lets no light past;
- it sits mostly on the back of the wrist, less often on the palm side near the base of the thumb, at the base of a finger, or on a fingertip beside the nail;
- on the foot it comes up on the instep and near the ankle, where it is the shoe rubbing rather than the lump itself that causes bother.
As a rule it does not hurt. A dull, dragging ache appears after exertion — working with tools, long hours at a keyboard, press-ups — and settles with rest. Sometimes there is numbness or weakness alongside it, which means the cyst is lying against a nerve and pressing on it. The cyst on a fingertip beside the nail has a sign of its own: it presses on the growth area and the nail starts coming through with a lengthwise groove.
Where it comes from
The linings of joints and tendons make lubricating fluid all the time. If a weak spot appears in the wall, fluid is squeezed out and blows up a little sac under the skin, joined on by a narrow stalk. That stalk works as a valve: fluid gets in easily and hardly comes back, so the lump sometimes swells and sometimes goes down a little, but does not disappear quickly by itself. The push comes from repetitive strain on the hand, a sprain or a knock; often no cause is found at all. The cyst beside the nail is the exception: it almost always goes with joint wear, which is why the finger joints around it look thickened.
What can hide behind a harmless-looking lump
This is the central question of the whole subject. There are plenty of look-alikes, and some of them need a completely different approach:
- lipoma — soft, doughy, larger and deeper, lets no light through;
- giant cell tumour of the tendon sheath — firm, does not roll, grows slowly and steadily, and is the second commonest lump on the hand;
- aneurysm of the radial artery — on the palm side of the wrist, and one thing sets it apart: it pulses under the finger; such a lump must never be punctured;
- nerve tumour — tapping it sends an electric shock into the fingers;
- gout deposit — hard, whitish, with a history of attacks of joint pain;
- rheumatoid nodule — alongside morning stiffness and symmetrical joint involvement;
- bony outgrowth — as hard as bone, immobile, of a piece with it;
- inflamed tendon sheath — not a ball but a painful ridge, with pain that flares when the thumb is moved away from the hand;
- infection — red hot skin, pain at rest and at night, a temperature;
- soft tissue sarcoma — vanishingly rare, but exactly the one that must not be missed: a hard, fixed mass sitting deeper than the muscle fascia, growing and never shrinking, more than a few centimetres across.
An ordinary ganglion is soft and mobile, shines through and changes size. Anything hard, fixed, pulsating or steadily growing needs a doctor to look at it rather than a waiting game.
Who gets them more often
They appear at any age but mostly in young adults, and considerably more often in women than in men. Repetitive hand movements encourage them: keyboard and mouse, vibrating tools, sewing, hairdressing scissors, gymnastics and weight-bearing on the hands, playing an instrument. Past sprains and knocks add to the odds too. Cysts by the nail joint belong to later life and worn joints. Children get them as well, and there is a pleasant quirk there: in children they go away on their own more often than in adults, so nobody rushes to intervene.
What you can do yourself
If the lump neither hurts nor gets in the way, the sensible course is to leave it alone and keep an eye on it: a ganglion by itself does not stop you working, driving, playing sport or lifting. When exertion brings on a dull ache, simple things help: work out which movements make it worse and take breaks; wear an elastic wrist support while you use the hand; take a painkiller from the non-steroidal anti-inflammatory group or rub on a topical product of the same class. A pharmacist can advise which support to buy and what you may take without a prescription.
Two things must not be done. Do not puncture or squeeze the cyst yourself — that introduces infection, and a puncture beside the nail can carry it straight into the finger joint, which is genuinely serious. And forget the old trick of bursting a ganglion with a blow from a heavy book: the fluid spreads through the tissues, the lump comes back within months, and bones and ligaments suffer into the bargain. Heat, compresses and ointments promising to "dissolve" it do nothing to a firm capsule.
What the doctor does and which tests are needed
An examination is usually enough: the doctor judges where the lump sits, whether it is soft, whether it shifts, whether it shines through, whether it pulses, and checks how the fingers work and whether sensation is intact. If the picture is typical, no tests are needed. An ultrasound scan is arranged when there is doubt: it tells fluid from solid tissue, shows the stalk and its link with the joint, and sees the artery if one runs alongside. An MRI scan is rarely needed — for deep-lying lumps, for suspected nerve compression, or when the mass does not behave like a cyst. An x-ray does not show the ganglion itself, but it answers the question about the state of the joint and any bony outgrowths.
What is offered if it gets in the way
There is no need to treat a ganglion simply because it is there. Treatment is discussed when it hurts, limits movement, presses on a nerve or spoils the nail.
- Watching. The commonest choice. A good share of cysts go away on their own, and there is nothing passive about that wait: you risk nothing.
- Aspiration. The doctor draws off the contents with a needle and sometimes injects an anti-inflammatory afterwards. It is quick, but the stalk stays where it was, and the cyst comes back in roughly half of cases. On the palm side of the wrist, where the artery runs close by, the method is used with caution.
- Surgery. The cyst is cut out along with the stalk and a piece of the joint capsule, which is the only way to lower the chance of return; it is done through a small cut or with keyhole instruments inside the joint. Recurrences happen after surgery too, though less often; in exchange you get a scar, a few weeks of restriction and a small risk of catching the nerve or vessel running past. People opt for it when the nuisance of the cyst outweighs all of that.
The cyst beside the nail is a case of its own. If the skin over it has thinned and fluid is leaking, waiting is unwise: that is an open road into the joint for bacteria, and such cysts are usually removed, taking out the bony outgrowths that feed them at the same time.
When the visit cannot wait
See a doctor the same day if:
- the skin over the lump has turned red and hot, pus appears or a temperature comes up;
- the lump has become sharply painful, hurts at rest and keeps you awake;
- numbness, pins and needles or weakness appear in the hand or fingers and gripping becomes difficult;
- the mass pulses in time with the heartbeat;
- the lump is hard, fixed, growing fast and never shrinking;
- the skin over the cyst by the nail has broken and is leaking.
One rarity deserves a mention of its own: a cyst can grow not beside a nerve but inside its sheath. This happens most often on the outer side of the knee, and then the foot stops lifting and the person begins to slap it down when walking. Sudden weakness of the foot or hand calls for urgent advice, because here time matters.
Online consultation
A lump on the wrist is a convenient thing to start with a doctor at a distance. From your description and a video you record — how the lump shifts, whether it changes with movement, whether it shines through under a torch — the doctor will judge whether it looks like an ordinary ganglion, say whether anything needs doing at all, and explain what to expect from watching, from aspiration and from surgery, so that you decide with the facts in front of you. The same appointment can go over how you use the hand and what to change, and which support to buy. And it will name the signs that call for a face-to-face examination: pulsation, numbness, redness with fever, a hard growing mass. Those are not worth sitting on in a message thread.
This material is for information only and does not replace medical advice.
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