Finding a strange bump on your wrist or hand can be worrying, especially when you don’t know where it came from.
The good news is that many wrist and hand lumps are benign (noncancerous). One of the most common causes is a ganglion cyst—a fluid-filled lump that often develops near a joint or tendon.
However, not every lump is the same. Some are related to the skin, others come from bones, joints or tendons, and occasionally a lump needs medical investigation.
Here are five possible causes of a bump on your wrist or hand and what you should do about them.
Ganglion Cyst
A ganglion cyst is one of the most common explanations for a lump around the wrist.
It is a round or oval sac containing a thick, jelly-like fluid. Ganglion cysts usually form near joints or tendons and commonly appear around the wrist or hand. They are not cancerous.
The lump may be small—sometimes around the size of a pea—or become considerably larger.
Interestingly, its size can change. Some people notice that the lump becomes more prominent with activity and smaller during periods of rest.
What Does a Ganglion Cyst Feel Like?
Many ganglion cysts don’t hurt at all.
When a cyst presses against nearby nerves or other structures, however, it may cause aching, tingling, weakness or problems moving the joint.
What Should You Do?
If the cyst isn’t painful and doesn’t interfere with normal movement, treatment may not be necessary. Some ganglion cysts shrink or disappear on their own.
If it causes significant pain or limits movement, a healthcare professional may recommend temporarily supporting the joint, draining the cyst with a needle (aspiration), or in some cases surgically removing it. A cyst can return even after treatment.
Never try to pop, puncture or hit a suspected ganglion cyst yourself. Doing so can damage surrounding tissues or lead to infection.
Epidermoid Cyst
Another possibility is an epidermoid cyst.
These are usually slow-growing lumps beneath the skin containing keratin, a protein naturally found in skin.
They are often painless, although an inflamed or ruptured cyst can become tender, swollen or uncomfortable.
Unlike a ganglion cyst, which develops around a joint or tendon, an epidermoid cyst originates in the skin.
What Should You Do?
A small cyst that isn’t causing symptoms may not require treatment.
But if the lump becomes painful, inflamed, infected, rapidly changes or keeps returning, it should be evaluated by a healthcare professional.
Don’t squeeze or cut it open yourself. That can increase irritation and infection risk.
Carpal Boss
A hard bump on the back of the hand near the wrist may be something called a carpal boss.
Unlike a ganglion cyst, a carpal boss isn’t a fluid-filled cyst. It is a firm, bony prominence near the base of the index or middle finger where the hand meets the wrist.
Because both can produce a visible bump in a similar area, people sometimes mistake one for the other.
A carpal boss may cause no symptoms at all. In other cases, repetitive wrist movement can be associated with discomfort or tenderness around the area.
What Should You Do?
If the bump doesn’t hurt or interfere with hand movement, treatment may not be necessary.
When symptoms occur, a healthcare professional may recommend modifying activities, temporary splinting or other treatments depending on the cause and severity.
Imaging such as an X-ray can sometimes help distinguish a bony carpal boss from other types of wrist lumps.
Giant Cell Tumor of the Tendon Sheath
The name sounds alarming, but a giant cell tumor of the tendon sheath is typically a benign growth.
These tumors develop around the tendon sheath and commonly affect the hand or fingers.
They often grow slowly and may appear as a firm lump.
Because several different conditions can produce similar-looking lumps, imaging such as ultrasound or MRI may sometimes be used as part of the evaluation.
What Should You Do?
Any persistent or enlarging solid lump deserves professional assessment.
Treatment depends on the diagnosis, location and symptoms. When treatment is necessary, surgical removal is commonly considered.
Most importantly, don’t try to diagnose a solid lump based only on photographs or how it feels.
Rheumatoid Nodules
People with rheumatoid arthritis (RA) can sometimes develop firm lumps known as rheumatoid nodules.
These lumps tend to occur near areas exposed to pressure and may appear around joints, including the hands.
However, a wrist lump alone doesn’t mean that someone has rheumatoid arthritis.
RA usually involves other symptoms, such as joint pain, swelling and prolonged stiffness, and diagnosis requires a medical assessment.
What Should You Do?
Someone who already has rheumatoid arthritis should mention new or changing nodules to their healthcare professional.
If you haven’t been diagnosed with RA but experience persistent swelling and stiffness in several joints—especially alongside new lumps—medical evaluation can help determine what’s happening.
How Can You Tell What Kind of Lump You Have?
Appearance alone isn’t always enough.
A healthcare professional may examine the lump’s location, size, firmness, mobility and tenderness and ask whether it changes with activity.
For a suspected ganglion cyst, diagnosis is often possible through physical examination. When the diagnosis is uncertain, ultrasound, X-ray or MRI may sometimes be used to determine whether a lump is fluid-filled or solid and to rule out other conditions.
That’s particularly important when a lump doesn’t behave like a typical ganglion cyst.
When Should You See a Doctor?
Don’t panic simply because you’ve discovered a wrist lump. Many causes are benign.
However, NHS guidance recommends getting a lump assessed if you’re worried about it, if it is getting larger, or if it is hard and doesn’t move. A lump that becomes very painful, hot or red deserves more urgent medical attention.
You should also seek medical advice if you experience persistent numbness, tingling, weakness or difficulty moving the wrist or hand.
Don’t Try to Pop a Wrist Lump at Home
You may have heard of the old practice of hitting a ganglion cyst with a heavy object to make it disappear.
Don’t do it.
Mayo Clinic specifically advises against hitting a ganglion cyst or attempting to puncture it yourself. Hitting it can damage the hand, while puncturing it can cause an infection.
A medical professional can determine whether drainage or another treatment is actually appropriate.
The Bottom Line
Finding a bump on your wrist doesn’t automatically mean something serious.
Ganglion cysts are common, noncancerous and often don’t require treatment. Other possibilities include epidermoid cysts, a carpal boss, giant cell tumors of the tendon sheath and rheumatoid nodules.
But because different conditions can look similar, avoid diagnosing a new lump yourself.
If it is growing, hard, unusually painful, red or hot, or causing numbness, weakness or problems moving your hand, getting it professionally evaluated is the safest approach.
Medical disclaimer: This article is for general educational purposes only and is not intended to diagnose or treat any medical condition.
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