Quick answer: A pea-sized lump under the toe is most often a callus or corn over a pressure point, a plantar wart, or a small cyst, and sometimes a fibroma or bursa. Most are harmless and respond to padding and roomier shoes; a lump that is painful, growing, or changing should be checked by a podiatrist.
Medically reviewed by Dr. Tom Biernacki, DPM
Board-certified podiatric surgeon | Balance Foot & Ankle
Last reviewed: May 2026
Three conditions cause pea-sized lumps under the toes — and the one patients can most easily identify by touch at home is actually the least common in our clinic. Our podiatrists explain which self-palpation finding points to the diagnosis that requires the most urgent evaluation. Call (810) 206-1402 — expert podiatric care across Michigan.
A lump under a toe is alarming out of proportion to its actual significance in most cases — the vast majority are benign. But characterizing exactly what you have is important because the management varies considerably, and a minority of lumps do warrant expedited evaluation.
What Could a Pea-Sized Lump Under the Toe Be?
The differential diagnosis for a pea-sized lump beneath a toe is narrow compared to other foot lumps, because the anatomy here is limited: plantar fat pad, flexor tendon sheath, digital nerve, nail structures, and skin. Here are the most common causes:
1. Plantar Digital Fibroma
The most common soft tissue mass of the toe plantar surface. A plantar digital fibroma is a benign proliferation of fibroblasts within the fibrous tissue of the plantar digital pad. It presents as a firm, non-tender (or mildly tender with pressure) nodule directly under the toe tip or pad. It does not transilluminate (meaning it is not fluid-filled).
These are distinct from plantar fibromatosis (Ledderhose disease) which involves the plantar fascia itself. Digital fibromas are smaller, more focal, and rarely grow significantly. They are usually asymptomatic or minimally symptomatic with the pressure of walking.
Management: Observation for asymptomatic lesions. Padding to offload the area. Surgical excision for persistently symptomatic lesions — recurrence after excision is uncommon for isolated digital fibromas unlike plantar fascia fibromatosis.
2. Ganglion Cyst of the Tendon Sheath
A ganglion cyst arising from the flexor tendon sheath of the toe presents as a smooth, compressible, often transilluminable lump directly over or around the flexor tendon. Pressing on it may produce a dull aching sensation. The cyst contains thick, gelatinous hyaluronic acid fluid.
Transillumination is a useful bedside test: shine a small flashlight directly against the lump in a darkened room — fluid-filled cysts glow red, while solid masses do not. A ganglion will transilluminate; a fibroma will not.
Management: Most ganglion cysts resolve spontaneously over months to years. Aspiration (draining with a needle) provides temporary relief but recurs in approximately 50% of cases. Surgical excision with removal of the cyst stalk from the tendon sheath has the best long-term outcomes.
3. Inclusion Cyst (Epidermoid Cyst)
An inclusion cyst forms when skin cells are pushed below the surface by minor trauma and begin to proliferate, creating a keratin-filled sac. Under the toe, these present as firm, smooth, non-tender to mildly tender nodules. They may grow slowly over months. If infected, they become acutely red, warm, and tender.
Infected inclusion cysts require drainage and antibiotics. Non-infected asymptomatic cysts can be observed or surgically excised if bothersome.
4. Giant Cell Tumor of Tendon Sheath
The second most common soft tissue tumor of the hand and foot after ganglion cysts, giant cell tumor of tendon sheath (also called pigmented villonodular synovitis in its diffuse form) presents as a firm, slowly growing, lobulated mass attached to a tendon sheath. It is benign but locally aggressive — it can erode adjacent bone over time.
These do not transilluminate (solid tumor, not fluid). They are typically painless until large enough to compress adjacent structures. MRI demonstrates the characteristic hemosiderin deposits as low signal on all sequences.
Treatment is surgical excision with removal of the synovial attachment — local recurrence rate is approximately 10–20% without complete synovectomy of the affected sheath.
5. Subungual or Periungual Cyst
A cyst arising from or adjacent to the nail matrix (myxoid or mucous cyst) presents at the base of the toenail, often just proximal to the cuticle. It is typically smooth, flesh-colored to slightly translucent, and compressible. Myxoid cysts contain a clear gelatinous fluid and are often connected to the DIP joint. They can cause longitudinal grooves in the nail plate from matrix compression.
Key takeaway: The most reliable bedside differentiator: transillumination. Shine a flashlight on the lump in a dark room. Ganglion cysts and myxoid cysts glow red (fluid-filled). Fibromas, giant cell tumors, and solid masses do not.
⚠️ When a toe lump requires urgent evaluation:
- Rapid growth over weeks
- Hard, fixed, non-mobile mass attached to bone
- Overlying skin ulceration or discoloration
- Lump in a diabetic or immunocompromised patient
- Any mass in a child — bone tumors and soft tissue sarcomas, though rare, are more common in pediatric age groups
- Associated systemic symptoms (weight loss, fatigue, fever)
When to See a Podiatrist
Any lump that is growing, painful with normal walking, interfering with shoe wear, or has any of the warning features above should be evaluated promptly. For most asymptomatic pea-sized lumps that have been stable for months, an elective appointment is appropriate. A physical examination with ultrasound or MRI as needed provides a definitive diagnosis and treatment plan.
MOST COMMON MISTAKE WE SEE
Patients assume any lump under the toe is a plantar wart and start treating it with over-the-counter salicylic acid. The most important things to rule out are a plantar fibroma (which needs to be monitored) and a corn (heloma molle), which is treated completely differently from a wart. Self-treating the wrong diagnosis delays resolution by months. Lumps under or between the toes that persist beyond 2–3 weeks, grow, or are painful deserve a podiatry visit — the diagnosis takes about 60 seconds in person.
RED FLAGS — SEE A PODIATRIST PROMPTLY
- Lump is rapidly growing over days to weeks
- Lump is hard, fixed to underlying tissue, and cannot be moved
- Lump is accompanied by systemic symptoms: fever, unintentional weight loss, fatigue
- Skin over the lump is discolored (dark, red, or ulcerated)
- Multiple lumps appearing simultaneously in different locations
- Lump in a diabetic patient — any new foot growth requires professional evaluation
Call (810) 206-1402 or book online — most urgent presentations seen same or next business day.
Frequently Asked Questions
Can a ganglion cyst go away on its own?
Yes — approximately 40–50% of ganglion cysts resolve spontaneously over 6–18 months. Observation is a reasonable initial approach for asymptomatic or minimally symptomatic cysts. Active treatment (aspiration or surgery) is appropriate for persistently painful or rapidly enlarging cysts.
Is a lump under the toe a sign of cancer?
Soft tissue sarcomas under the toe are exceptionally rare. The vast majority of pea-sized lumps in this location are benign — fibromas, ganglion cysts, or inclusion cysts. However, any rapidly growing, hard, fixed lump or a lump with the warning features above should be evaluated promptly.
The Bottom Line
A pea-sized lump under a toe is almost always benign — the differential is narrow and well-defined. Transillumination at home provides a useful initial clue. Any lump that is growing rapidly, painful, or has warning features deserves prompt evaluation. Most stable, asymptomatic lumps can be monitored with an elective appointment.
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What causes a pea-sized lump under a toe?
The most common causes of a small lump under a toe: (1) Plantar digital neuroma (Morton’s neuroma) — a thickening of the interdigital nerve, typically between the 3rd and 4th toes, causing burning and numbness; (2) Plantar plate injury or tear — damage to the ligament under the metatarsophalangeal joint, causing a tender nodule with toe instability; (3) Ganglion cyst — fluid-filled sac from a tendon sheath, soft and movable; (4) Wart (verruca) — pinpoint bleeding with a hard keratotic surface; (5) Accessory bone (sesamoid) — normal anatomical variant. Diagnosis requires clinical exam; imaging (ultrasound or MRI) is used for confirmation.
Is a lump under a toe serious?
Most lumps under toes are benign, but the cause determines urgency. Neuromas, plantar plate tears, and ganglions are non-serious but need treatment to prevent worsening. Any lump that is rapidly growing, painless, hard, or fixed to the bone warrants urgent evaluation to rule out rare soft tissue tumors or bone involvement. In a person with diabetes, any new lump under the foot should be evaluated promptly due to infection risk from skin breakdown.
When should I see a podiatrist about a lump under my toe?
See a podiatrist if symptoms persist beyond 4 weeks, limit normal activity, or you have diabetes or poor circulation. Same-day appointments at Balance Foot & Ankle — (810) 206-1402 — Howell & Bloomfield Hills, MI.
For a complete clinical overview: Our Complete Ankle & Foot Conditions Guide — explains all common ankle pain conditions, diagnosis & evidence-based treatments from a Michigan DPM.
Dr. Tom Biernacki, DPM is a double board-certified podiatrist and foot & ankle surgeon at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has reached over one million views.
- Diagnosis and Treatment of Plantar Fasciitis (PubMed / AAFP)
- Heel Pain (APMA)
- Hallux Valgus (Bunions): Evaluation and Management (PubMed)
- Bunions (Mayo Clinic)
Footwear & Orthotics for a Lump Under the Toe
A lump under the toe is aggravated by hard, flat soles. Cushioned podiatrist-recommended shoes and soft orthotics offload the spot. If it grows or hurts, have it evaluated.
Dr. Tom Biernacki, DPM is a board-certified foot & ankle surgeon (ABFAS & ABPM) at Balance Foot & Ankle Specialists in Southeast Michigan. With over a decade of clinical experience, he specializes in heel pain, bunions, diabetic foot care, sports injuries, and minimally invasive surgery. Dr. Biernacki is a member of the APMA and ACFAS, and his patient education content on MichiganFootDoctors.com and YouTube has made him one of the most-followed foot & ankle educators on YouTube.