Foot Cyst and Lump Diagnosis 2026 | Podiatrist

Should I worry about a lump on the bottom of my foot?

Most lumps on the bottom of the foot are plantar fibromas, warts, or benign pressure-related lesions — all benign. A lump on the bottom of the foot that is soft and in the arch is likely a plantar fibroma. A hard, painful spot under the ball of foot is more likely a wart or callus than a cyst. The features most concerning for something serious: a lump that is fixed to deep tissue and can’t be moved, growing rapidly, or accompanied by skin color changes. If you have any of these features, see a podiatrist rather than monitoring at home.

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

Yes — up to 50% of ganglion cysts resolve spontaneously without treatment over months to years. If a ganglion is small and painless, watchful waiting is a reasonable approach. The old-fashioned “Bible treatment” (striking the cyst with a heavy book to rupture it) is no longer recommended — it’s ineffective and can damage surrounding structures. If the cyst is painful, growing, or cosmetically bothersome, aspiration or surgical removal are safe and effective options.

What does a plantar fibroma feel like?

A plantar fibroma feels like a firm, non-moveable nodule in the arch of the foot — like a small pebble stuck just under the skin on the bottom. It’s embedded within the plantar fascia and moves with the fascia when you flex your foot but doesn’t slide around independently. Pressing directly on it is usually tender. It’s most noticeable when barefoot or in thin-soled shoes. Unlike a ganglion, it doesn’t fluctuate in size with activity.

Ganglion Cyst — Most Common

A ganglion cyst is a fluid-filled sac that arises from a joint capsule or tendon sheath. On the foot, they most commonly appear on the top of the foot (dorsum) at the midfoot joint, or on the ankle. They feel rubbery or firm, are not attached to the overlying skin, and are typically smooth and round. They often fluctuate in size — smaller when rested, larger after activity. Many are painless; some become painful when they press on a nerve or when shoes compress them.

Small painless ganglions can be watched. If painful, treatment options include aspiration (draining with a needle in-office) or surgical excision. Aspiration is faster with less recovery but has a higher recurrence rate (50-70%); surgical removal has a lower recurrence rate but requires recovery time. We perform both procedures at Balance Foot & Ankle.

Plantar Fibroma

A plantar fibroma is a benign fibrous nodule within the plantar fascia (the thick band on the bottom of the foot). It feels like a firm, pea-to-marble-sized lump in the arch of the foot that doesn’t move when you press on it — it’s embedded within the fascia. It’s often tender when pressed directly, and may cause discomfort when walking barefoot or on hard surfaces. Multiple fibromas in a progressive pattern is called plantar fibromatosis (Ledderhose disease).

Treatment is usually conservative first — a custom orthotic with a cutout beneath the nodule to offload pressure, cortisone injection, and stretching. Surgical excision is reserved for painful fibromas that don’t respond to conservative care, but recurrence rates are significant (up to 60% in some studies). Verapamil gel (applied topically) has shown promise for reducing fibroma size in small studies.

Lipoma

A lipoma is a benign fatty tumor. On the foot, lipomas appear as soft, doughy, moveable lumps under the skin. They’re usually painless unless they grow large enough to press on a nerve or structure. Foot lipomas are less common than lipomas elsewhere in the body (arms, trunk, neck) because feet have little subcutaneous fat. If a lipoma is growing or causes symptoms, surgical excision is the treatment.

Bursitis — Fluid-Filled Sac Over a Bony Prominence

A bursa is a small fluid-filled sac that cushions between bone and soft tissue. Bursitis — inflammation of a bursa — creates a lump over a pressure point. On the foot, bursitis most commonly occurs over the Haglund’s deformity (back of the heel, the “pump bump”), over a bunion at the first MTP joint, and under the heel pad. The lump from bursitis is soft, fluctuant (feels like it has fluid inside), and directly over a bony prominence. It’s often painful when pressed.

Other Foot Lumps Worth Knowing

Subungual exostosis — a bony growth under the toenail, causing the nail to be pushed up and the toe tip to feel hard and lumpy. Requires x-ray to confirm; surgical removal resolves it definitively. Accessory navicular — an extra bone on the inner ankle above the arch, present from birth in about 10% of people, which can become symptomatic in adulthood as a painful prominence. Plantar wart — caused by HPV, a wart on the plantar surface feels like a hard lump when walking; distinguished from a callus by pinch test pain (warts hurt with side-to-side pinching; calluses hurt with direct pressure) and by tiny black dots (thrombosed capillaries). Corn over a toe joint — a hardened skin lesion over a bony prominence, not a true cyst or lump, but often mistaken for one.

How Foot Cysts Are Diagnosed

Diagnosis is usually clinical — the size, location, consistency (firm vs. soft vs. rubbery), mobility, and tenderness together point to the most likely diagnosis. X-ray identifies bony causes (exostosis, accessory navicular). Ultrasound is excellent for ganglion cysts and differentiates solid from fluid-filled masses. MRI is used for soft tissue masses that are atypical or concerning, or to plan surgical resection. We have digital x-ray in both our Howell and Bloomfield Township offices.

In-Office Treatment at Balance Foot & Ankle

We evaluate and treat all types of foot lumps and cysts, including ganglion cyst aspiration, plantar fibroma injection, and surgical excision of symptomatic masses. If you have a foot lump you’re uncertain about, an evaluation gives you a definitive diagnosis and a treatment plan. Most lump evaluations can be done same-day with in-office imaging.

Same-day appointments available. (810) 206-1402 | Book online

Frequently Asked Questions