- A plantar fibroma is a benign (non-cancerous) nodule that develops in the plantar fascia, usually in the arch of the foot.
- It typically presents as a firm, pea-sized to walnut-sized lump that you can feel through the skin.
- First-line treatment is custom orthotics designed to offload the fibroma, with possible corticosteroid injection for painful cases.
- Surgical removal is an option but has a meaningful recurrence rate — we discuss the tradeoffs in detail.
- Most fibromas are slow-growing and can be managed conservatively for years; rapid growth or change warrants prompt evaluation.
What is a plantar fibroma?
A plantar fibroma is a benign growth of fibrous tissue within the plantar fascia — the thick band of tissue running along the bottom of the foot. It typically appears as a firm nodule in the arch, ranging from pea-sized to walnut-sized, that you can feel through the skin. When multiple fibromas appear along the fascia, the condition is called plantar fibromatosis (Ledderhose disease).
Plantar fibromas are not cancerous, do not spread, and are not life-threatening — but they can be painful when they grow large enough to press against the inside of a shoe. The exact cause is unclear; genetics likely play a role (it can run in families, and patients with palmar fibromas in the hand — Dupuytren's contracture — are at higher risk). They are more common in middle-aged adults.
At Northwest Extremity Specialists, our approach to plantar fibromas balances symptom relief against the realities of treatment. Painless, slow-growing fibromas can often just be observed. Painful fibromas almost always respond to custom orthotics that offload the area, with corticosteroid injection added for stubborn pain. Surgical removal is an option, but recurrence after surgery is not uncommon — so the decision to operate is made carefully and only after non-surgical options have been tried.
The plantar fascia is a thick, fibrous band of connective tissue that spans the sole of the foot. A plantar fibroma develops as a thickening or nodule within this fascia, typically in the central or medial portion of the arch. The nodule is composed of fibroblasts and dense collagen — similar in nature to the tissue that forms a Dupuytren's contracture in the hand. As the nodule grows, it can become palpable through the skin and may begin to press against the shoe with weight-bearing.
What it feels like
Plantar fibromas are often noticed by the patient as a lump in the arch. Common symptoms include:
- A firm nodule felt in the arch of the foot, ranging from pea-sized to walnut-sized
- Pain when standing or walking, especially in firm-soled shoes
- A feeling of stepping on a small stone
- Slow growth over months or years
- Multiple nodules along the arch in some patients (Ledderhose disease)
- Discomfort that's worse barefoot on hard surfaces
- A nodule that's usually not red or warm — the inflammation is mechanical, not infectious
Why it develops
The exact cause of plantar fibromas is not fully understood. Known associations include:
- Family history of plantar or palmar fibromas
- Coexisting Dupuytren's contracture in the hand
- Long-term use of certain medications (some anti-seizure drugs)
- Repetitive microtrauma to the plantar fascia (debated)
- Diabetes, alcohol use, and liver disease (loose associations)
- Increasing age — most common in midlife and beyond
How we diagnose a plantar fibroma
A plantar fibroma is typically diagnosed on physical exam — the lump is palpable, well-defined, and located within the plantar fascia. Your provider will assess size, mobility, tenderness, and look for additional nodules. Ultrasound is sometimes used to confirm the location and characterize the nodule. MRI is occasionally ordered if the diagnosis is unclear or if pre-surgical planning is being done. Biopsy is rare and is only considered if the lesion doesn't look or behave like a typical fibroma.
Non-surgical care
Most plantar fibromas can be managed conservatively. The goal is to relieve pain and slow progression — not to make the fibroma disappear, which conservative care generally cannot do:
- Custom orthotics with a relief well cut out to offload the fibroma
- Cushioned, supportive shoes with a wide footbed
- Padding placed around the fibroma to reduce pressure
- Anti-inflammatory medication for pain flares
- Corticosteroid injection in selected painful cases
- Verapamil topical cream in some patients (off-label, evidence mixed)
- Activity modification during acute pain episodes
Surgical care
Surgical removal is considered when the fibroma is significantly painful and has not responded to conservative care, or when it is rapidly growing. The decision is made carefully — surgical removal carries a recurrence rate of 20–50% depending on the technique, and a recurrent fibroma is often larger and more painful than the original.
- Local excision (removal of the nodule with a margin of surrounding fascia)
- Wide excision (removal of a larger portion of the plantar fascia along with the fibroma) — lower recurrence rate but longer recovery
After plantar fibroma surgery, most patients are non-weight-bearing for 2–3 weeks, then progress through a boot for several more weeks. Return to athletic shoes typically takes 6–10 weeks. Wound healing on the bottom of the foot can be slow, and patients are counseled in detail about scar formation and the possibility of recurrence.
When to see a specialist
- A firm lump in the arch of the foot — particularly if it's growing or painful
- Arch pain that's worse with standing or weight-bearing
- Multiple nodules along the bottom of the foot
- A change in the size, shape, or feel of a lump you've had for a while
- Any sudden growth — to make sure it is in fact a fibroma and not something else
Plantar fibroma evaluation and conservative management is performed by any of our board-certified podiatrists. Surgical excision, when needed, is performed by Dr. Mia Horvath or Dr. Thomas Melillo at our Tigard Locust office.