Plantar Fibromas – Lumps in the Arch of Your Foot
Plantar fibromas are benign lumps in your foot's arch that can cause pain. Learn about diagnosis, why they develop, and conservative and surgical treatment options.
By Dr. Robert Hoover, DPM, FACFAS
Plantar Fibromas – Lumps in the Arch of Your Foot
Have you noticed a firm lump in the arch of your foot? This could be a plantar fibroma—a benign growth in the plantar fascia, the thick band of tissue that runs along the bottom of your foot. While typically not dangerous, plantar fibromas can cause discomfort and pain. At Central Florida Foot & Ankle Institute, we diagnose and treat plantar fibromas with a range of conservative and surgical options to restore your foot comfort.
Understanding Plantar Fibromas
A plantar fibroma is a benign (non-cancerous) fibrous nodule that develops within the plantar fascia—the tissue that supports your arch and helps you walk and run. The MedlinePlus plantar fasciitis page is talking about that same band: the thick tissue on the bottom of your foot that connects the heel bone to the toes and holds up the arch. These growths are typically firm, well-defined nodules that you can often feel or see as a bulge in your arch. Unlike plantar fasciitis (inflammation of the plantar fascia), plantar fibromas are distinct growths rather than inflammation of the entire fascia.
Plantar fibromas are not dangerous or life-threatening and don't develop into cancer. However, they can become painful and may grow larger over time, requiring treatment to restore foot comfort and function.
What Causes Plantar Fibromas?
The Root Cause Remains Mysterious
Interestingly, the exact cause of plantar fibromas isn't fully understood. Unlike many foot conditions that develop from specific trauma or activities, plantar fibromas appear to arise from genetic and cellular factors within the plantar fascia tissue.
Genetic Predisposition
Plantar fibromas tend to run in families, suggesting a genetic component. If your parents or close relatives have plantar fibromas, you're at higher risk of developing them yourself.
Association with Dupuytren's Contracture
Interestingly, plantar fibromas are associated with Dupuytren's contracture, a similar condition affecting the palms of the hands. People with Dupuytren's contracture have a higher likelihood of developing plantar fibromas, and both conditions may share genetic or cellular mechanisms.
Potential Risk Factors
While not definitively proven, several factors appear to increase risk:
- Trauma or injury to the foot – previous injuries may trigger fibroma development
- Age – fibromas typically develop in middle-aged or older adults
- Male gender – more common in men than women
- Certain medications – beta-blockers and anticonvulsants have been associated
- Repeated stress on the plantar fascia – high-impact activities may contribute
Recognizing Plantar Fibromas
What You'll Notice
A plantar fibroma typically feels like:
- A firm, nodular lump in the arch of your foot
- A bulge or thickening in the plantar fascia
- A palpable mass that doesn't go away with rest
- A growth you can often feel or see when examining your foot
The fibroma may be visible as a bulge in your arch, or it might be deeper in the tissue and primarily palpable by touch.
Pain Characteristics
Some plantar fibromas cause no symptoms and are discovered incidentally. Others cause significant discomfort:
- Pain in the arch of your foot, usually where the fibroma is located
- Discomfort that worsens with walking or running
- Pain that may intensify with barefoot activities
- Difficulty with certain shoes that put pressure on the arch
- Pain that can radiate along the plantar fascia
- Tenderness when the fibroma is pressed
Progressive Changes
Unfortunately, plantar fibromas tend to grow over time. Some people develop multiple fibromas. As they grow, they typically cause increasing pain and may eventually interfere with walking or running.
How We Diagnose Plantar Fibromas
Clinical Examination
During your visit to Central Florida Foot & Ankle Institute, we'll examine your foot carefully, palpating the arch to identify the fibroma. We'll note:
- Location and size of the nodule
- Consistency (usually firm)
- Tenderness with pressure
- Impact on foot function
- Associated symptoms
Imaging Confirmation
Ultrasound effectively visualizes plantar fibromas, showing the size, location, and relationship to surrounding tissues. Ultrasound is often our first imaging choice because it's safe, cost-effective, and provides excellent soft tissue visualization.
MRI provides detailed imaging when ultrasound findings are inconclusive or when we need detailed information about the fibroma's relationship to surrounding structures. MRI can definitively confirm the diagnosis and rule out other conditions.
X-rays are typically not helpful for soft tissue fibromas unless we're assessing bone changes.
Treatment Options
Observation and Monitoring
For plantar fibromas that cause no symptoms or minimal symptoms, observation is reasonable. We'll monitor the fibroma during regular appointments and recommend treatment only if symptoms develop or worsen.
Conservative Care for Symptomatic Fibromas
For painful plantar fibromas, conservative treatment aims to reduce pressure on the growth and manage symptoms.
Activity Modification
- Reduce high-impact activities like running
- Switch to low-impact exercise like swimming or cycling
- Take frequent rest breaks
- Avoid prolonged walking or standing
- Use ice after activity to reduce discomfort
Footwear Adjustments
- Wear shoes with soft, cushioned insoles
- Avoid tight shoes that compress the arch
- Consider shoes with arch support that redistributes pressure
- Avoid barefoot walking
- Try wider shoes that don't press on the arch
Custom Orthotics
Specially designed shoe inserts can:
- Provide cushioning directly under the fibroma
- Redistribute pressure away from the growth
- Support the arch and reduce strain
- Significantly reduce pain in many cases
Many patients experience substantial improvement with proper orthotics.
Strapping and Padding
- Plantar fascia strapping techniques reduce stress on the fibroma
- Metatarsal pads or arch pads provide direct cushioning
- Padding can be added to shoes to reduce pressure
Anti-Inflammatory Measures
- Ice applications after activity reduce inflammation
- Over-the-counter anti-inflammatory medications may help
- Elevation when resting reduces swelling
Advanced Conservative Treatments
Corticosteroid Injections
When conservative measures don't provide sufficient relief, a corticosteroid injection into or around the fibroma may reduce inflammation and pain. This treatment often provides several months of relief.
Platelet-Rich Plasma (PRP) Therapy
PRP injections introduce concentrated healing factors that may reduce inflammation and slow fibroma growth.
Radiation Therapy (Rarely Used)
In some cases, low-dose radiation therapy has been used to slow plantar fibroma growth. This is typically reserved for multiple or rapidly growing fibromas that don't respond to other treatments.
Surgical Options
If conservative treatment doesn't adequately control symptoms, or if the fibroma is large or rapidly growing, surgical removal becomes an option.
Plantar Fibroma Excision
Surgical removal involves:
- Careful dissection of the fibroma from surrounding tissue
- Preservation of the plantar fascia and surrounding nerves
- Closure of the surgical wound
- Relatively straightforward procedure with good outcomes
Recovery from Surgery
- 2-3 weeks for initial healing
- 6-8 weeks before returning to light activities
- 3-6 months for return to running and high-impact sports
- Most people experience complete pain relief after surgery
Important Consideration: Recurrence
While surgical removal typically provides pain relief, recurrence is possible. Approximately 10-15% of people who undergo surgery develop recurrent fibromas at the same site or elsewhere in the fascia. However, many surgeons believe the benefits of surgery outweigh this risk.
Prevention Strategies
Unfortunately, because the exact cause of plantar fibromas isn't known, specific prevention strategies are limited. However, these general measures may help:
- Avoid foot trauma and injuries
- Maintain healthy body weight
- Wear supportive footwear
- Take regular rest breaks if you have high-impact activities
- Address foot pain or biomechanical issues early
When to See a Podiatrist
If you've noticed a lump in the arch of your foot—whether painful or not—schedule an appointment with Central Florida Foot & Ankle Institute. Early diagnosis helps us monitor the fibroma and provide treatment before symptoms become severe.
Bring your concerns to us if you have:
- A noticeable lump or bulge in the arch of your foot
- Pain in the arch of your foot
- Discomfort with certain shoes or activities
- A fibroma that seems to be growing
- Multiple lumps in your feet or hands (Dupuytren's contracture)
Restore Comfort to Your Feet
While plantar fibromas can be frustrating, they're highly treatable. Most people find relief with conservative approaches using custom orthotics and activity modification. For those who need additional help, advanced treatments and surgery are effective options.
Our team at Central Florida Foot & Ankle Institute has extensive experience diagnosing and treating plantar fibromas. We'll work with you to develop a personalized treatment plan that addresses your specific needs and goals, helping you return to pain-free walking and your favorite activities.
Call (407) 307-0006 or book at https://floridafai.intakeq.com/booking today. With convenient locations throughout Central Florida—Lake Mary (Waymont and MedPlex) and Downtown Orlando / SODO—we're ready to help you achieve foot comfort and improved quality of life. People also drive in from Sanford, Altamonte, and Longwood — we do not have offices in those towns.