Medically reviewed by Tom Biernacki, DPM — Board-Certified Podiatric Foot & Ankle Surgeon, Balance Foot & Ankle PLLC. Updated May 7, 2026. Clinical authority: 15+ years draining subungual hematomas, treating runner’s toe, and managing nail-bed lacerations at our Howell and Bloomfield Hills locations.
Quick Answer
Subungual hematoma is blood trapped under a toenail after an impact, dropped object, or repetitive shoe pressure (runner’s toe). If the dark area covers more than 50% of the nail or the pain is throbbing, see a podiatrist within 48 hours for trephination (a tiny drainage hole) — it relieves pain instantly and saves the nail. X-ray is needed if there was a high-impact injury to rule out distal phalanx fracture.
If you dropped a 12-pack on your toe last night and woke up with a throbbing, dark purple toenail you cannot stop staring at — or if you finished a long run and the nail has gone from pink to deep red to almost black over the last 24 hours — you are looking at a subungual hematoma. Patients walk into our clinic almost daily with one, and the first question is almost always the same: “Am I going to lose the nail?” The answer depends on three things: how big the hematoma is, how soon you came in, and whether the bone underneath broke. The good news is that a 30-second in-office procedure called trephination can relieve the pain instantly and, when done within 48 hours, often saves the nail entirely.
What Is a Subungual Hematoma?
A subungual hematoma is a collection of blood trapped between the toenail plate and the underlying nail bed. The nail bed has a remarkably rich blood supply — when small vessels rupture there is nowhere for the blood to drain because the rigid nail plate above forms a tight seal. The trapped blood expands under pressure, and that pressure is exactly why subungual hematomas are so disproportionately painful. Patients often describe the throb as worse than the original injury and worse than any other foot pain they have had. It is the same physiology as a blood blister, but with the rigid nail acting as a lid that cannot relieve itself.
The condition has two distinct presentations. Acute traumatic subungual hematomas happen in seconds — a dropped frozen turkey, a stubbed toe on the bedframe, a closed door on the foot — and the toe goes from normal to deeply painful within minutes. Chronic or repetitive subungual hematomas, classically “runner’s toe,” develop over hours to days as the front of a too-short shoe pounds the toenail with every step. Both produce the same trapped-blood appearance, but the management of the chronic version focuses heavily on shoe fit and gait, not just the immediate drainage.
Symptoms & What It Looks Like
The hallmark of a fresh subungual hematoma is a sharply demarcated dark red, purple, or nearly black patch beneath the nail plate, sometimes with a smaller satellite spot, and almost always with throbbing pain in the affected toe. As the blood ages over days, the color shifts to dark brown, then to a more gray-purple. By the second week, the discolored area begins to migrate distally as the nail grows out and is replaced by clear nail behind it. The whole process from injury to fully clear new nail typically takes 6–9 months for a great toenail and 4–6 months for a smaller toenail, simply because that is how long it takes a toenail to grow from the cuticle to the tip.
- Dark red, purple, or black discoloration under the nail with a clear edge
- Throbbing pain proportional to how much of the nail is involved
- Pressure sensation when the toe is in a closed-toe shoe
- Tenderness to direct touch on the nail surface
- Swelling of the surrounding skin (paronychia-like)
- Lifting of the nail plate from the bed (onycholysis) in larger hematomas
- Discoloration migrating outward as the nail grows over weeks
- Total nail loss in 25–50% of larger or untreated hematomas
Causes: Acute Trauma vs Runner’s Toe
Subungual hematomas have one final common pathway — bleeding into a closed space — but multiple distinct mechanisms produce the injury. In our clinic, the cause matters because it dictates both the immediate management and the prevention plan. A patient hit by a falling object needs an X-ray to rule out a tuft fracture; a marathon runner needs a shoe-fit conversation. We see all of the following weekly, year-round.
- Dropped object on the toe — frozen food, dumbbell, can, glass jar
- Stubbed toe against a hard surface (bedframe, doorframe, threshold)
- Crush injury from a closed door, lawnmower, or rolling object
- Runner’s toe — repetitive forefoot impact in too-short shoes during long-distance running, soccer, basketball, hiking
- Tennis toe / climber’s toe — abrupt deceleration in tennis shoes or climbing shoes
- Ill-fitting shoes with toe-box too small or too tight
- Hallux limitus or rigidus — restricted big-toe motion drives the nail against the shoe
- Hammer or claw toe deformities with the nail rubbing against the shoe
- Anticoagulant medications (warfarin, apixaban, aspirin) — make even minor trauma cause large hematomas
- Surgical or postoperative nail bed bleeding
Differential: When It’s NOT Just Trapped Blood
Most dark spots under a toenail are subungual hematomas, but a small percentage are not — and one of the alternatives, subungual melanoma, is a potentially fatal cancer that gets missed in roughly half of cases at first presentation. The single most reliable distinguishing question is: did this start with a clear injury, and is it migrating distally as the nail grows? A true hematoma marches forward with the nail. A melanoma stays put, grows, and may extend into the surrounding cuticle skin (Hutchinson’s sign). Any pigmented nail finding in a non-traumatic setting, in a darker-skinned patient, in a single nail with a longitudinal stripe, or in a lesion that is not migrating, deserves a biopsy.
| Condition | How It’s Different from Subungual Hematoma |
|---|---|
| Subungual melanoma | No clear trauma history; longitudinal pigmented stripe; widening over months; extension into cuticle skin (Hutchinson’s sign); does NOT migrate distally with nail growth — biopsy mandatory |
| Onychomycosis (fungal nail) | Yellow-brown discoloration with thickening, crumbling debris under the nail, no acute pain, often multiple nails involved |
| Splinter hemorrhage | Tiny linear streaks under the nail from minor trauma or systemic disease (endocarditis, vasculitis); not a confluent dark patch |
| Glomus tumor | Rare; exquisitely tender to point pressure and to cold; small bluish spot under the nail; benign but disabling; surgical excision |
| Distal phalanx fracture | May coexist with hematoma after high-impact injury; X-ray reveals; up to 50% of large traumatic subungual hematomas have an underlying tuft fracture |
| Subungual exostosis | Bony outgrowth under the nail causing chronic elevation; visible on X-ray; surgical excision |
| Pyogenic granuloma | Friable red bump under or around the nail that bleeds easily on contact; usually after trauma or with ingrown nail |
Key takeaway: A pigmented spot under a single toenail with NO history of trauma — particularly a longitudinal brown-black stripe that extends into the cuticle — is melanoma until biopsy proves otherwise. We do not “watch” these. We refer for biopsy.
How We Evaluate It
Evaluation begins with the story. A clear traumatic event minutes to hours before presentation, a confluent dark patch with a sharp leading edge, and a throbbing toe make the diagnosis at a glance. The next decision point is whether an X-ray is needed. In our clinic, every patient with a high-impact mechanism (dropped heavy object, crush injury) gets an X-ray of the toe in two views, because up to 50% of large traumatic subungual hematomas have an underlying tuft fracture of the distal phalanx that changes management — antibiotics may be considered if the nail bed is open over a fracture (technically an open fracture). Pure shoe-rub runner’s toe rarely needs imaging.
- Mechanism history — dropped object, crush, shoe rub, anticoagulant use
- Inspection & size estimate — what percent of the nail plate is involved
- Test for nail-plate avulsion — is the nail still firmly attached or partially lifted
- X-ray (two views) after high-impact trauma to rule out distal phalanx fracture
- Tetanus status review if any open wound or fracture
- Dermatoscopy when melanoma is on the differential — non-traumatic onset, single nail, atypical pattern
- Biopsy for any concern for melanoma — refer to dermatology or perform nail-bed biopsy
Treatment Ladder & Trephination
Treatment depends on the size of the hematoma, the time since injury, the presence of a fracture, and the integrity of the nail plate. Trephination — making a tiny drainage hole through the nail with a heated cautery tip or 18-gauge needle — is the most rewarding office procedure in podiatry. The patient walks in with throbbing 9/10 pain, the procedure takes 30 seconds, and they walk out comfortable. The procedure is most effective within the first 48 hours while the blood is still liquid; after 72 hours the clot has organized and trephination becomes less effective. Hematomas covering more than 50% of the nail, or any hematoma associated with an underlying fracture or partially avulsed nail, may require formal nail removal and nail-bed repair under digital block.
- Ice + elevation + NSAIDs in the first 24 hours for any hematoma — reduces continued bleeding
- Topical comfort — Doctor Hoy’s Natural Pain Relief Gel on the surrounding skin (never on broken skin or open hematoma drainage)
- Office trephination for hematomas covering 25–50% of the nail with significant pain — heated cautery or 18-gauge needle, 30 seconds, instant relief
- Roomy, open-toe footwear for 1–2 weeks to off-load the nail
- X-ray and reassessment if mechanism was high-energy; rule out fracture
- Tetanus booster if last shot was >5 years ago and there is any open wound
- Formal nail removal & nail-bed repair for hematomas >50% with significant nail-bed laceration, partial nail avulsion, or open phalanx fracture
- Oral antibiotics after open fracture or if nail-bed laceration was contaminated
- Wound care & dressing changes daily for 1 week after any drainage or repair
- Shoe-fit and gait evaluation for runner’s toe; correct toe-box length, replace shoes
- Treat underlying deformity — hallux limitus, hammer toe, claw toe — to prevent recurrence
Should You Drain It at Home?
Patients ask this every day. Our honest answer: for a small, painful subungual hematoma in an otherwise healthy person without diabetes, without anticoagulants, without an open wound, and without a high-impact mechanism, careful home drainage with a sterile heated paperclip can be effective and is well documented in emergency medicine literature. That said, we do not recommend it as a first choice. The reasons we ask people to come in are practical: the office procedure is more sterile, we can confirm there is no underlying fracture or nail-bed laceration that needs repair, the office cautery makes a clean hole rather than a charred crater, and we can identify the rare melanoma masquerading as a “minor injury.” If you do drain it at home, never use anything sharp like a needle pushed downward (you will lacerate the nail bed), and do not drain a hematoma if you have diabetes, take blood thinners, or the toe is deformed.
⚠️ Warning Signs: When to See a Podiatrist Today
Most subungual hematomas are not emergencies, but the following deserve same-day evaluation to avoid losing the nail or missing a fracture or melanoma.
- Hematoma covering more than 50% of the visible nail plate
- Severe throbbing pain not relieved by ice and NSAIDs
- Nail partially lifted off the nail bed (avulsion)
- Visible crack or deformity of the toe (rule out fracture)
- Open laceration through the nail bed or surrounding skin
- Signs of infection — increasing redness, warmth, pus, fever, lymphangitic streaking
- Diabetes, peripheral artery disease, or neuropathy — any toenail injury demands evaluation
- You are on anticoagulants — drainage and bleeding management are different
- Dark pigmentation without trauma history or a longitudinal brown-black stripe — rule out melanoma
- Nail loss exposing the nail bed — needs proper dressing and follow-up
The Most Common Mistake We See
The most common mistake we see is waiting too long to drain it. Patients show up at day five or seven, by which time the trapped blood has clotted and organized, the trephination provides little relief, and the lifted nail plate is on its way to falling off. A 30-second procedure on day one would have saved the nail. The runner-up mistake is missing the underlying fracture. Up to half of large traumatic subungual hematomas have a tuft fracture of the distal phalanx underneath, and the technically correct phrase for hematoma with nail-bed laceration over a fracture is open fracture. That changes the antibiotic decision and the follow-up plan. Anyone with a dropped-object mechanism deserves an X-ray.
The third common mistake — and the one that rivals melanoma for danger — is watching a non-traumatic dark spot. If a patient cannot remember an injury, the discoloration has been growing for months, it does not migrate distally with nail growth, or it extends into the cuticle (Hutchinson’s sign), it must be assumed to be subungual melanoma until biopsy proves otherwise. Subungual melanoma five-year survival drops sharply with delayed diagnosis, and the most common reason for delay is exactly this assumption that “it’s just a bruise.”
Will My Toenail Fall Off?
For hematomas covering less than 25% of the nail, drained promptly, the nail almost always stays attached. For hematomas covering 25–50%, the nail stays in roughly 70% of cases. For hematomas covering more than 50%, the nail will eventually be pushed off in roughly half of cases as the new nail grows in behind it — even with perfect treatment. If the nail does come off, this is a normal process and not a problem as long as the underlying nail bed has not been lacerated. A new nail begins to regrow within days of loss and reaches the tip of the toe over the following 6–9 months. The new nail may grow in slightly thickened or with a ridge for the first cycle and then normalize. Permanent nail deformity (split, ridged, or absent nail) is uncommon unless the nail bed itself was injured.
Prevention (Especially for Runners)
For acute traumatic hematomas there is little you can do beyond reasonable foot caution and protective footwear in industrial settings. For runner’s toe, however, prevention is highly effective and follows three rules: shoes with a thumbnail-width of room beyond the longest toe, lacing that locks the heel in place so the foot does not slide forward, and clipped, smoothed toenails that cannot catch on the inside of the shoe. We see runner’s toe almost exclusively in patients wearing their everyday casual size in a running shoe; running shoes typically need to be a half-size larger to accommodate forefoot swelling and forward foot slide on long runs.
- Run in shoes a half-size larger than your everyday size — a thumbnail of space beyond the longest toe
- Use a heel-lock lacing pattern to prevent forward foot slide on downhills and long runs
- Trim toenails straight across and file the corners weekly — never longer than the tip of the toe
- Replace running shoes every 300–500 miles — worn shoes lose toe-box structure
- Wear closed-toe protective footwear for industrial work, lawn care, and moving heavy objects
- Treat hammer toes and hallux rigidus that drive nails against the shoe roof
- Address shoe fit during marathon training — the foot lengthens 5–10% in long efforts
- Daily nail inspection in diabetics — even minor trauma deserves evaluation
Frequently Asked Questions
How long does it take a subungual hematoma to heal?
The pain typically resolves within hours of trephination, and the visible discoloration migrates outward as the nail grows and is fully gone in 6–9 months for the great toenail and 4–6 months for smaller toenails. If the nail itself falls off, a new one regrows behind it over the same time frame. The process cannot be rushed because that is simply how fast a toenail grows.
When is a subungual hematoma an emergency?
It becomes urgent — though not life-threatening — if the hematoma covers more than 50% of the nail, if the pain is severe and unrelieved by ice and NSAIDs, if the nail has been partially torn off, if there is open bleeding through a laceration, or if the underlying toe is deformed (suggesting fracture). Same-day evaluation is also indicated for anyone with diabetes, peripheral artery disease, or who takes anticoagulants.
Should I leave a subungual hematoma alone or drain it?
Small, minimally painful hematomas covering less than 25% of the nail can be left alone, treated with ice, elevation, and NSAIDs. Larger or painful hematomas — particularly those covering more than 25% of the nail or causing throbbing pain — benefit from professional drainage within 48 hours. Trephination relieves the pressure instantly and improves the chance of saving the nail.
Can a subungual hematoma get infected?
Yes, particularly if the nail bed is lacerated, if there is an open wound, or if drainage was performed in a non-sterile manner. Watch for increasing redness, warmth, pus, fever, or red streaking up the foot. Diabetics are at higher risk and should be seen the same day. A clean, sealed hematoma that is intact has a low infection risk on its own.
Why is my toenail black if I never injured it?
This is the question that should always trigger a podiatrist or dermatologist visit. Possibilities include subtle repetitive trauma you did not register (runner’s toe, shoe rub), fungal pigmentation, splinter hemorrhage, melanonychia from medications, or — most importantly — subungual melanoma. Any pigmented nail finding without a clear traumatic history deserves dermatoscopic evaluation and possible biopsy.
Will my new toenail look normal?
Usually yes. If the nail bed itself was not lacerated, the new nail grows in normally. The first regrown nail may be slightly thickened or ridged for one growth cycle and then return to baseline. Permanent splitting, ridging, or absence of the nail typically follows nail-bed laceration that was not surgically repaired, which is why proper evaluation of larger hematomas matters even when the patient is not in pain.
The Bottom Line
A subungual hematoma is blood trapped under the toenail after impact, crush, or repetitive shoe pressure. The trapped pressure makes it disproportionately painful, and a 30-second office trephination relieves the pain instantly when done within 48 hours. Hematomas larger than 50% of the nail, or those with high-impact mechanisms, deserve an X-ray to rule out a tuft fracture; nail-bed lacerations may need formal repair. The single non-negotiable: if the dark pigmentation appeared without a clear injury, is not migrating outward as the nail grows, or extends into the cuticle skin, it must be evaluated to rule out subungual melanoma. Most subungual hematomas heal completely; the few that turn out to be melanoma have a much better prognosis when caught early.
Sources
- Salter SA, Ciocon DH, Gowrishankar TR, Kimball AB. Controlled nail trephination for subungual hematoma. American Journal of Emergency Medicine. Trephination Outcomes.
- Roser SE, Gellman H. Comparison of nail bed repair versus nail trephination for subungual hematomas in children. Journal of Hand Surgery. Nail-Bed Repair Comparison.
- Levine N. Subungual hematoma. Geriatrics. Clinical Review.
- Levitt JO, Levitt BH, Akhavan A, Yanofsky H. Onychomycosis vs subungual melanoma differentiation. Cutis. Subungual Melanoma Recognition.
- Adigun CG. Melanonychia: differential diagnosis and management. American Academy of Dermatology. AAD Melanoma Resources.
Drain It Before You Lose the Nail
Drs. Tom Biernacki, Carl Jay, and Daria Gutkin offer same-day subungual hematoma drainage, X-ray, and nail-bed evaluation at our Howell and Bloomfield Hills locations. Trephination within 48 hours saves the nail in most cases.
Or call (810) 206-1402 · 4330 E Grand River Ave, Howell MI 48843 · 43494 Woodward Ave #208, Bloomfield Hills MI 48302
Foot pain typically responds best to early podiatrist evaluation, conservative treatments such as supportive footwear and targeted physical therapy, and—when needed—custom orthotics or in-office procedures. Most patients see meaningful improvement within 4-6 weeks of starting a structured treatment plan. Schedule an evaluation at our Howell or Bloomfield Hills office for a clinical assessment.
What is Foot pain?
Foot pain is a common foot/ankle condition that affects mobility and quality of life. Understanding the underlying cause is the first step in successful treatment. Our podiatrists at Balance Foot & Ankle perform a hands-on biomechanical exam, review your activity history, and use diagnostic imaging when appropriate to identify the root cause—not just treat the symptom. Many patients have been told to “rest and ice” without a deeper diagnostic workup; our approach is different.
Symptoms and warning signs
Common signs of foot pain include pain that worsens with activity, morning stiffness, swelling, tenderness when palpated, and difficulty bearing weight. If you experience sudden severe pain, inability to walk, visible deformity, numbness or color change, contact our office the same day or visit urgent care—these can signal a more serious injury such as a fracture, tendon rupture, or vascular compromise. Diabetics with any foot wound should seek same-day care.
Conservative treatment options
Most cases of foot pain respond to non-surgical care: structured rest, supportive footwear changes, custom orthotics, targeted stretching and strengthening protocols, anti-inflammatory medications when medically appropriate, and in-office procedures such as ultrasound-guided injections. We also offer advanced therapies including MLS laser therapy, EPAT/shockwave, regenerative injections, and image-guided procedures. Treatment is sequenced from least invasive to most invasive, and we explain the rationale at every step.
When is surgery considered?
Surgery is reserved for cases that fail 3-6 months of well-structured conservative care, when there is structural pathology (severe deformity, complete tear, advanced arthritis), or when imaging shows damage that will not heal without intervention. Our surgeons have performed 3,000+ foot and ankle procedures and prioritize minimally-invasive techniques whenever appropriate. We discuss recovery timelines, return-to-activity milestones, and realistic outcome expectations before any procedure is scheduled.
Recovery timeline and prevention
Recovery from foot pain varies based on severity and chosen treatment path. Conservative cases often improve within 4-8 weeks with consistent adherence to the protocol. Post-procedural recovery may range from a few days (in-office procedures) to several months (reconstructive surgery). Long-term prevention involves footwear assessment, activity modification, structured strengthening, and regular check-ins with your podiatrist if you have a history of recurrence. We provide written home-exercise plans and digital follow-up support.
Dr. Tom’s Recommended Products for Black Toenail / Subungual Hematoma Recovery
- CURREX RunPro Insoles — For runners with recurring black toenails: dynamic flex zones reduce toe box impact on downhill running. The insole I put in my own running shoes. (30% commission)
- PowerStep Pulse Performance Insoles — Running-specific arch support that stabilizes the foot and reduces forward slide in the shoe — a key cause of repeated toenail trauma. (30% commission)
- Doctor Hoy’s Natural Pain Relief Gel — For the throbbing pain that accompanies acute subungual hematoma. Apply around (not on) the nail to the surrounding tissue. (30% commission)
A subungual hematoma covering more than 25% of the nail, or occurring without clear trauma, needs same-day evaluation to rule out subungual melanoma. Book a same-day appointment → · (810) 206-1402
Ready to feel better?
Same-week appointments available in Howell and Bloomfield Hills, Michigan.
Dr. Tom’s Clinic-Recommended Products
The OTC orthotic I recommend most. Medical-grade arch support at a fraction of custom orthotic cost. Holds shape 12+ months.
Natural topical pain relief — arnica + menthol + magnesium. Used in our clinic. No greasy residue. FSA-eligible.
As an Amazon Associate and Foundation Wellness affiliate I earn from qualifying purchases at no extra cost to you.
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.
Related Treatments at Balance Foot & Ankle
Our board-certified podiatrists offer advanced treatments at our Bloomfield Hills and Howell locations.
Recommended Products from Dr. Tom