A Firm Lump in the Arch of Your Foot — What It Is and What to Do About It
A plantar fibroma is a firm, benign growth that develops within the thick band of tissue running along the bottom of your foot — the plantar fascia. It sits right in the arch, feels like a hard pea or knuckle, and does not move when you press it sideways. It is not a cyst, not a tumor, and not cancerous. It is a dense knot of scar-like tissue that the body has built within the plantar fascia and, for reasons we don’t fully understand, keeps building.
Plantar fibromas do not go away on their own. They tend to grow slowly and can become painful when walking, standing, or wearing certain shoes. When multiple nodules develop along the arch, the condition is called plantar fibromatosis or Ledderhose disease. Our podiatrists evaluate and treat plantar fibromas at our Coon Rapids and Golden Valley offices, serving patients across the north and west metro including Maple Grove, Ham Lake, Andover, Champlin, Blaine, Plymouth, Wayzata, Minnetonka, St. Louis Park, and Edina.
Not cancerous — but worth getting checked. Plantar fibromas are always benign. That said, any new or growing lump on the foot should be properly evaluated to confirm the diagnosis. A firm, fixed lump in the arch that has been there for months without growing rapidly is almost certainly a plantar fibroma, but an exam and imaging give you a definitive answer.
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What Makes a Plantar Fibroma Different From Other Foot Lumps?
The key things that distinguish a plantar fibroma from other lumps on the foot:
- Location: always on the bottom of the foot, in the arch. Never on the top or side. Always in line with the plantar fascia.
- Feel: firm, sometimes hard, non-mobile. When you try to push it sideways it does not move — because it is grown into the fascia itself, not sitting on top of it.
- Not fluid-filled: unlike a ganglion cyst, a plantar fibroma cannot be drained with a needle. It is solid tissue. See our Ganglion Cysts & Lumps page for how the two compare.
- Not plantar fasciitis: plantar fasciitis causes diffuse heel pain that is worst in the morning. A plantar fibroma causes pain directly over the nodule in the arch, from direct pressure. They can both be present at the same time.
Why Do Plantar Fibromas Develop?
The exact cause is not fully understood, but several factors are consistently associated:
- Family history: plantar fibromas tend to run in families. If a parent or sibling has one, your risk is higher.
- Dupuytren’s contracture: this is a hand condition where the same type of fibrous tissue thickens in the palm, causing the fingers to curl. People with Dupuytren’s are significantly more likely to also develop plantar fibromas — they are different expressions of the same underlying tendency.
- Repetitive foot stress: prolonged standing, running on hard surfaces, or footwear that concentrates pressure on the arch may contribute.
- Other factors: chronic alcohol use, diabetes, and certain medications have been associated with higher rates of plantar fibromatosis.
Symptoms
- A firm, fixed nodule you can feel in the arch of your foot
- Pain when direct pressure is applied to the nodule — particularly on hard floors, when barefoot, or when the shoe insole presses on it
- Pain that builds during prolonged standing or walking and eases with rest
- In fibromatosis: multiple nodules, possible tightening of the arch over time, and progressive difficulty with footwear
Plantar fibroma vs. plantar fasciitis: plantar fasciitis hurts at the heel, worst with first steps in the morning. A plantar fibroma hurts right where the lump is, from direct pressure. They are different conditions — though they can coexist in the same foot.
Diagnosis
A plantar fibroma is usually straightforward to diagnose on examination. We can confirm it with ultrasound or MRI. MRI is preferred when the diagnosis is uncertain, if we would like to rule out other causes, or when we need a detailed picture before planning treatment.
Treatment at Family Foot & Ankle Clinic
There is no single treatment that reliably eliminates plantar fibromas permanently. Our approach moves through a sensible progression based on how symptomatic the fibroma is.
Observation
If the fibroma is small and not causing meaningful pain or activity limitation, monitoring it without active treatment is appropriate. We document the size at each visit and act when — and only if — it becomes symptomatic.
Offloading — Footwear and Custom Orthotics
The most consistently effective conservative treatment is reducing the pressure directly on the nodule. A custom orthotic with a precise cut-out beneath the fibroma keeps your body weight off it with every step. Soft insoles, avoidance of hard floors barefoot, and footwear with cushioned soles all contribute. For many patients this is enough to manage symptoms comfortably long-term.
More on our Custom Orthotics page.
Corticosteroid Injection
A corticosteroid (steroid) injection placed directly into the fibroma can help reduce pain, soften the lump, and sometimes make it smaller. Many patients notice improvement after a series of 3–5 injections spaced about a month apart. While some fibromas shrink significantly, they are not completely eliminated and may gradually grow back over time. Steroid injections can be a good option for painful nodules and may help delay or avoid surgery. Possible side effects include temporary skin thinning or lightening at the injection site, loss of the cushioning fat pad, and, rarely, weakening of the plantar fascia with repeated injections.
Topical Verapamil
Topical verapamil is a prescription topical applied directly over the fibroma twice daily. It works by slowing the growth activity within the nodule. Studies show that some patients see the fibroma soften and shrink with consistent use over several months. It works best for smaller, earlier-stage fibromas. Your doctor will prescribe it through a compounding pharmacy.
Shockwave Therapy (EPAT)
Shockwave therapy (EPAT) for plantar fibroma. EPAT (Extracorporeal Pulse Activation Technology) uses acoustic pressure waves to stimulate the body’s natural healing response within the fibroma. It can help reduce pain, soften the nodule, and improve comfort with walking and daily activities. While some patients notice a decrease in the size of the fibroma, the primary goal is symptom relief rather than complete elimination of the lump. Treatment is non-invasive, performed in our office, requires no incision or anesthesia, and has little to no downtime. Most patients undergo 3–6 treatments, typically one week apart. EPAT is an excellent option for patients who have not improved with shoe modifications, orthotics, or corticosteroid injections and who want to avoid surgery. This treatment is offered as a cash-pay service. → See our Shockwave Therapy (EPAT) page.
Surgery
Surgery is reserved for fibromas that are causing significant, ongoing pain that has not responded to conservative management. The key things to know upfront:
- The fibroma is part of the fascia: it cannot simply be scooped out. The surgeon removes the fibroma along with a section of the surrounding plantar fascia tissue. This makes recovery longer than a simple cyst removal.
- Recurrence is common: between 25 and 60 percent of plantar fibromas come back after surgery, and the recurrence rate is higher in patients with multiple nodules or a strong family history. In some cases, the fibroma can return larger, involve more of the plantar fascia, or become more painful than before surgery, making additional treatment more challenging. Because of this, surgery is generally reserved for patients whose symptoms significantly affect their quality of life after exhausting non-surgical options. We discuss this honestly before any surgical decision is made.
See our Foot & Ankle Surgery Overview for general information.
Frequently Asked Questions
Will my plantar fibroma go away on its own?
Unlikely. Most plantar fibromas grow slowly over time and do not resolve without treatment. Some stay small and stable for years; others enlarge progressively. The right approach depends on how symptomatic it is. If it is not causing significant pain or limitation, monitoring it is reasonable. If it is bothering you, we work through the treatment options above.
I have Dupuytren’s in my hand. Am I at risk for this in my foot?
Yes. Dupuytren’s contracture and plantar fibromatosis are closely related conditions. If you have Dupuytren’s, you are at increased risk of developing plantar fibromas. Not everyone with Dupuytren’s develops them, but if you notice a new lump in the arch of your foot or develop pain while walking, schedule an evaluation so treatment can begin before symptoms become more limiting.
How do I know if it’s a plantar fibroma and not something more serious?
Most firm, slow-growing lumps in the arch of the foot turn out to be benign plantar fibromas. However, because other types of soft tissue masses can occasionally appear similar, we believe in making the correct diagnosis before recommending treatment. We often recommend MRI, which provides a more complete evaluation of the foot and helps ensure that a more serious condition is not overlooked. Once the diagnosis is confirmed, we can discuss the treatment options that are best for you. If you are unsure about a foot lump, a visit — or a Second Opinion — gives you a definitive answer.
Firm Lump in Your Arch? Get It Properly Evaluated and a Clear Plan.
Most plantar fibromas can be managed effectively with the right combination of offloading and treatment. Surgery is an option, but rarely the first step. Book an appointment at our Coon Rapids or Golden Valley office.
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Serving Coon Rapids, Golden Valley, Maple Grove, Ham Lake, Andover, Champlin, Blaine, Plymouth, Wayzata, Minnetonka, St. Louis Park, Edina, and all Twin Cities communities.