Lump on the Foot or Toe: What It Could Be

What a foot or toe lump can be

The foot has 26 bones, more than 30 joints, many tendons and a thick pad of fat and fibrous tissue on the sole. A lump can arise from any of them, or from the skin. Doctors sometimes call it a pedal mass ("pedal" means of the foot) or a digital mass when it is on a toe. These terms describe the lump, not its cause.

The single most useful clue is location:

Common causes of a lump on the foot

Ganglion cyst

A ganglion cyst is a fluid-filled sac that grows from a joint lining or tendon sheath. On the foot it usually sits on top of the midfoot or around the ankle. It feels smooth, round and rubbery, may change size from week to week, and often lights up if a flashlight is pressed against it. It hurts mainly when a shoe presses on it or when it presses on a nerve, causing tingling into the toes. About half shrink or disappear without treatment.

Bunions and bunionettes

A bunion is a bony bump on the inner side of the foot at the base of the big toe. The big toe drifts toward the second toe, pushing the joint outward. The skin over it is often red and thickened, and a fluid sac (bursa) may swell over it. A bunionette is the same problem on the outside of the little toe. Both develop gradually over years and run in families. Narrow, pointed or high-heeled shoes make them hurt.

Corns and calluses

Corns and calluses are areas of thickened skin that build up where bone presses against a shoe or the ground. A callus is a broad, flat patch, usually on the ball of the foot or heel. A corn is smaller, harder and cone-shaped, with a central core that presses inward and hurts like a pebble. Soft corns form between the toes, where sweat keeps them white and rubbery. A white, paper-like or chalky toe bump is most often a soft corn or callus softened by moisture.

Plantar warts

Plantar warts are caused by human papillomavirus (HPV) entering through tiny breaks in the skin of the sole. They are rough, grainy and often flattened inward by walking. The key sign is tiny black dots (clotted blood vessels) and the fact that skin lines go around the wart rather than through it. Squeezing a wart from side to side hurts more than pressing straight down, which is the opposite of a corn.

Plantar fibroma

A plantar fibroma is a firm, rubbery, non-cancerous nodule of fibrous tissue in the arch. It is attached to the plantar fascia, the tight band under the sole, so it does not move freely. It may be painless, or ache when standing and walking. Several nodules on one or both feet suggest plantar fibromatosis (Ledderhose disease), which is linked to Dupuytren's contracture of the hands.

Gout and gouty tophi

Gout causes sudden attacks of intense pain, redness and swelling, most often at the big toe joint, frequently starting at night. After years of high uric acid, crystals can collect under the skin as tophi: firm, yellow-white, chalky lumps around the toes, heel or ankle. A white, chalky toe bump in someone with a history of gout is very likely a tophus. Tophi can break through the skin and release a toothpaste-like material.

Bone spurs and other bony lumps

Bone spurs (osteophytes) form at arthritic joints, especially the top of the big toe joint (hallux rigidus) and the top of the midfoot. They feel hard and fixed and do not move with the skin. A subungual exostosis is a small bony growth under the toenail that lifts the nail. A hammer toe creates a bony knuckle on top of the toe that rubs and develops a corn.

Morton's neuroma

Morton's neuroma is a thickened nerve between the toes, usually the third and fourth. You may not see a lump, but it feels like standing on a marble or a folded sock, with burning or numbness spreading into the toes. Tight shoes make it worse and taking the shoe off and rubbing the foot helps.

Lipomas, cysts and other soft lumps

Lipomas, soft, doughy fatty lumps, are less common on the foot than elsewhere but do occur. Epidermoid (inclusion) cysts can form after a puncture wound. Bursitis creates a soft, fluid-filled swelling over a pressure point. Insect bites, foreign bodies such as a splinter of glass, and infected hair follicles cause tender lumps that appear quickly.

Rare but serious causes

Tumors of the foot are uncommon and most are benign. Cancers that can appear as a foot mass include soft tissue sarcomas (such as synovial sarcoma, which often affects young adults near the ankle), bone tumors, and melanoma. Acral lentiginous melanoma is the most common type of melanoma in people with darker skin. It can appear as a dark, growing spot on the sole or a dark streak under a toenail, and is sometimes mistaken for a bruise or wart.

A lump needs prompt imaging if it:

• keeps growing over weeks to months (a "gradual enlargement" is the key feature doctors look for)
• is larger than 5 cm (2 inches)
• lies deep, under the fascia, and is fixed to the tissues beneath
• causes pain at night or at rest
• comes back after it was removed

Painful vs painless foot lumps

A painless lump is not automatically safe. Many sarcomas are painless in the early stages, which is why steady growth matters more than pain.

When to worry about a foot mass

See a doctor or podiatrist (foot specialist) for any lump that:

• has not gone after 4 to 6 weeks
• is growing, hard, or fixed in place
• causes numbness, tingling or weakness in the toes
• changes color, bleeds, or is a dark spot under a nail
• is red, hot or draining

People with diabetes or poor circulation should have any new foot lump checked early. Reduced feeling means a pressure lump can break down into an ulcer without pain.

How a foot lump is diagnosed

1. Questions: how long it has been there, whether it has grown, whether it hurts, any injury, gout, diabetes or skin cancer history, and your footwear.
2. Examination: size, firmness, whether it moves, whether it is attached to skin, tendon or bone, and whether it transilluminates (lets light through). The doctor will check pulses and sensation.
3. Ultrasound: the first scan for most soft lumps. It shows whether the lump is a fluid cyst, a solid nodule, a neuroma or a foreign body.
4. X-ray: for bony lumps, bunions, spurs, arthritis and gout damage.
5. MRI: for deep, large or growing masses, or when ultrasound is unclear.
6. Aspiration or biopsy: fluid drawn from a joint shows gout crystals. A biopsy is done for any suspicious solid mass, ideally at a specialist sarcoma center.

Treatment for a lump on the foot or toe

Treatment depends on the cause:

• Ganglion cyst: watch and wait, padding, or draining it with a needle. Surgery is offered when it keeps returning or presses on a nerve.
• Bunion: wide, deep shoes with a soft upper, bunion pads, and pain relief. Surgery is for persistent pain, not appearance.
• Corns and calluses: a podiatrist can pare the hard skin. Cushioned insoles and well-fitting shoes stop them returning. Avoid medicated corn plasters if you have diabetes or poor circulation.
• Plantar warts: many clear on their own within 1 to 2 years. Salicylic acid treatments and freezing (cryotherapy) speed this up.
• Plantar fibroma: soft orthotics with a cut-out under the nodule. Steroid injections may help. Surgery is avoided where possible because fibromas often regrow.
• Gout: anti-inflammatory treatment for attacks, then long-term medicine to lower uric acid. Tophi shrink slowly as uric acid falls.
• Morton's neuroma: wider shoes, a metatarsal pad, steroid injection, and surgery if these fail.
• Suspected tumor: referral to a specialist team before any surgery.

What you can do at home

• Wear shoes with a wide, deep toe box and a soft upper.
• Use moleskin or gel pads to take pressure off a lump.
• For pain, use acetaminophen (paracetamol) or an anti-inflammatory such as ibuprofen at the label dose. Avoid NSAIDs if you have kidney disease or stomach ulcers.
• Do not cut corns or warts yourself with blades, and do not try to burst a cyst. Both risk infection.

Frequently asked questions

Why does the mass on my foot hurt?

A foot mass usually hurts because it is pressed by a shoe or by your body weight, or because it presses on a nerve. Bunions, corns, plantar warts, plantar fibromas and Morton's neuroma all hurt with walking. A sudden, very painful, hot swelling suggests gout or infection and needs prompt care.

What is a white, paper-like bump on my toe?

A soft white bump between the toes is most often a soft corn or callus kept moist by sweat. A firm, chalky white lump near a joint in someone with gout may be a tophus, a deposit of uric acid crystals. Peeling white skin between the toes can also be athlete's foot.

What is the medical term for a lump on the foot?

Doctors call it a foot mass, pedal mass or, on a toe, a digital mass. These are descriptive terms. The diagnosis names the cause, for example ganglion cyst, plantar fibroma or bunion (hallux valgus).

Should I worry about a foot lump that is slowly getting bigger?

Steady growth is the main feature that needs checking. Most growing foot lumps turn out to be ganglion cysts, fibromas or bunions, but gradual enlargement, a size over 5 cm, or a deep, fixed mass should be imaged with ultrasound or MRI to rule out a rare sarcoma.

Can a ganglion cyst on the foot go away on its own?

Yes. Many ganglion cysts shrink or disappear over months without treatment. If one hurts, presses on a nerve or makes shoes hard to wear, it can be drained with a needle or removed surgically, though cysts can come back after either.

Is a hard bump on top of my foot a bone spur?

It may be. A hard, fixed bump on top of the midfoot or big toe joint is often a bone spur from arthritis. A ganglion cyst in the same spot feels softer and more rubbery. An X-ray tells the two apart.