A plantar fibroma is a benign (non-cancerous) nodule that grows within the thick band of tissue running along the bottom of your foot, called the plantar fascia. These firm, rubbery lumps typically develop in the arch of the foot and can range from barely noticeable to large enough to cause pain when you stand or walk. The condition is also known as plantar fibromatosis, or Ledderhose disease when multiple nodules are involved.
Plantar fibromas are slow-growing and won’t spread to other parts of your body, but they also rarely go away on their own. Understanding what causes them, how they’re diagnosed, and what treatment looks like can help you figure out your next steps.
What a Plantar Fibroma Feels and Looks Like
The hallmark sign is a firm lump in the arch of your foot that you can feel through the skin. Most people notice it when they press on the bottom of their foot or when the nodule grows large enough to push against the skin’s surface. The lump is embedded within the plantar fascia itself, not sitting on top of it, which is why it feels like it’s “part of” the foot rather than something resting on the surface.
Some plantar fibromas cause no pain at all, especially when they’re small. Pain tends to develop as the nodule grows and begins pressing against the ground when you stand, walk, or wear shoes. The discomfort is usually worst with direct pressure on the lump, so tight shoes or extended time on your feet can make it more noticeable. You may develop a single nodule or multiple nodules on one or both feet.
Causes and Risk Factors
The exact cause of plantar fibromas isn’t fully understood. They can appear without any clear trigger and affect anyone. However, several patterns have emerged. There appears to be a genetic component: a familial inheritance pattern has been observed, and genome-wide screening has identified specific genetic variants associated with increased risk. If a biological family member has had plantar fibromas, your chances of developing one are higher.
Repetitive trauma or injury to the plantar fascia may also play a role, though many people develop nodules with no history of foot injury. Several health conditions are associated with higher risk:
- Diabetes
- Epilepsy
- Alcohol use disorder
- Dupuytren’s disease (a similar condition causing thickened tissue in the palm of the hand)
- Frozen shoulder
- Peyronie’s disease
The overlap with Dupuytren’s disease is notable. Both conditions involve abnormal growth of fibrous tissue, and having one increases your risk of developing the other. This suggests they may share an underlying mechanism related to how the body produces and regulates connective tissue.
How It’s Diagnosed
A plantar fibroma can often be identified through a physical exam alone. Your doctor will press on the bottom of your foot to feel for the characteristic firm, well-defined nodule within the arch. When imaging is needed to confirm the diagnosis or rule out other possibilities, ultrasound is the first-line tool.
On ultrasound, plantar fibromas appear as well-defined, nodular thickenings with no blood flow inside them and no signs of fluid or calcification. Small fibromas are actually easier to spot on ultrasound than on MRI because the nodule’s texture contrasts clearly against the normal fibrous tissue surrounding it. Ultrasound also has the practical advantage of being quick enough to examine both feet in one visit.
MRI is considered the second-line imaging option, typically reserved for cases where the diagnosis is uncertain or when surgery is being planned. On MRI, a plantar fibroma appears as a lobulated mass with characteristically low signal intensity on most sequences, reflecting its dense fibrous makeup.
Non-Surgical Treatment Options
If a plantar fibroma isn’t causing pain, it may not need treatment at all. Monitoring it over time is a reasonable approach. When pain does develop, treatment usually starts conservatively.
Custom orthotics or shoe inserts can redistribute pressure away from the nodule, making walking and standing more comfortable without changing the fibroma itself. Padding around (not directly over) the lump helps reduce direct contact with the ground. Stretching the plantar fascia and calf muscles may also ease tension across the bottom of the foot.
Steroid injections are a common next step. These work by reducing inflammation and slowing the growth rate of the fibrous tissue, which can shrink the nodule and relieve pain. The results, however, tend to be temporary. Studies show that nodules often return to their original size within three years of injection, so many people opt for repeated rounds. A typical course involves 3 to 5 injections spaced about 4 to 6 weeks apart. Multiple injection cycles do carry a risk: repeated steroid use in this area has been associated with rupture of the plantar fascia or nearby tendons.
When Surgery Becomes an Option
Surgery is generally reserved for plantar fibromas that cause persistent pain and haven’t responded to conservative treatment. The goal is to remove the nodule along with enough surrounding tissue to reduce the chance of it coming back. But recurrence is the central challenge of plantar fibroma surgery.
How much tissue is removed makes a significant difference in outcomes. A local resection, which removes just the nodule itself, carries a recurrence rate of about 67%. A wide resection, taking the nodule plus a margin of surrounding tissue, brings that down to roughly 42%. A fasciectomy, which removes a larger section of the plantar fascia, has the lowest recurrence rate at around 27%. For this reason, wide resection or fasciectomy is generally recommended over simple nodule removal.
Surgery does come with potential complications. These include painful scarring on the bottom of the foot, wound healing problems, nerve entrapment (which can cause numbness or tingling), and loss of arch height from removing a portion of the plantar fascia. When a fibroma does recur after surgery, the revision procedure typically requires an even wider excision, which increases the likelihood of these complications. This is a key reason why surgery is approached cautiously and usually isn’t the first recommendation.
Living With a Plantar Fibroma
Plantar fibromas are a chronic condition. They grow slowly, they don’t become cancerous, but they rarely disappear without intervention. Many people manage them successfully for years with orthotics and occasional injections, never needing surgery. Others find that the nodules grow large enough or numerous enough to significantly affect their mobility.
Wearing shoes with a roomy, cushioned arch area and avoiding going barefoot on hard surfaces can reduce daily discomfort. If you notice new lumps forming, a change in size, or increasing pain, that’s worth bringing up at your next appointment so your treatment plan can be adjusted before the problem limits your activity.