| Condition | Cause | Nail Appearance | X-ray | Treatment |
|---|---|---|---|---|
| Subungual Hematoma | Acute crush trauma; repetitive pressure (runner’s toe) | Dark blood collection (red → purple → brown → black) beneath nail plate; throbbing pain | Normal bone; rule out distal phalanx fracture | Trephination (drainage) if >50% nail involved and symptomatic; resolves spontaneously over 6–12 months as nail grows out |
| Subungual Melanoma | Melanocytic; UV or genetic; uncommon | Dark vertical streak (melanonychia striata); irregular pigment; Hutchinson’s sign (pigment extending to cuticle) | Possible distal phalanx erosion in advanced disease | Urgent biopsy; wide excision; oncology referral |
| Nail Avulsion Injury | Traumatic degloving; catching nail; crush | Partial or complete nail plate detached from bed | May show distal phalanx fracture (must rule out open fracture) | Replace nail plate as biologic dressing; antibiotics; nail bed repair if lacerated |
| Onychomycosis | Dermatophyte infection | Yellow-brown discoloration; thickened; crumbling; onycholysis; usually chronic onset | Normal | Topical efinaconazole or oral terbinafine; KOH prep confirms diagnosis |
| Toenail Bruise (runner’s toe) | Repetitive trauma from toe box contact during running | Black or dark discoloration; often bilateral 1st or 2nd toe; no acute event | Normal | Proper shoe fitting; reduce mileage; nail trimming; resolves spontaneously |
| Procedure | Indication | Technique | Outcome |
|---|---|---|---|
| Nail Trephination (Decompression) | Symptomatic subungual hematoma >50% nail area; severe throbbing pain | Heated needle, electrocautery, or bur creates hole through nail plate over hematoma; no anesthesia needed | Immediate pain relief in 90%+; nail regrows normally; minimal risk |
| Nail Avulsion (Partial or Complete) | Significantly lifted nail; infected subungual space; need to inspect nail bed | Digital block; English anvil technique; remove plate preserving matrix | Nail bed inspected and repaired; nail plate replaced as dressing; regrowth in 6–12 months |
| Nail Bed Repair | Laceration of nail bed with avulsion | Absorbable sutures (5-0 or 6-0 chromic); careful anatomic apposition to prevent nail deformity | Proper repair prevents permanent nail split or ridging |
| Nail Matrixectomy | Persistent nail deformity post-trauma; chronic ingrown nail at site | Chemical (phenol) or surgical ablation of nail matrix | Permanent cessation of nail growth at treated segment; 95% success with phenol |
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Medically Reviewed | Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle, Michigan
Quick Answer:
Quick Answer: A subungual hematoma is a collection of blood beneath the toenail — caused by acute trauma (door, heavy object, stubbing) or repetitive microtrauma (runner’s black toenail, tight-fitting footwear). Small hematomas (<25–50% of nail surface) may be observed and allowed to resolve; larger, painful hematomas are treated with trephination (drilling a small hole through the nail to release pressure and blood). Nail avulsion (removal of the nail plate) is indicated when the nail is detached, for chronic ingrown management, or when underlying nail bed injury requires inspection and repair. Dr. Biernacki performs both procedures in-office at Balance Foot & Ankle PLLC.
A black or dark purple toenail after stubbing your toe, dropping something heavy on your foot, or completing a long run or hike is almost certainly a subungual hematoma — a collection of blood trapped beneath the nail plate. It’s one of the most common foot injuries Dr. Tom Biernacki treats at Balance Foot & Ankle PLLC, and it’s also one of the most satisfying to treat: releasing the pressure typically provides dramatic, immediate relief.
This page explains when a black toenail needs urgent attention, how trephination works, when nail avulsion is indicated, and what runner’s toenail is and how to prevent it.
What Is a Subungual Hematoma?
The toenail lies in a tight space between the nail plate (the hard visible nail) and the nail bed (the vascular tissue below). When trauma forces blood into this space, pressure builds rapidly with nowhere to go — producing the characteristic throbbing pain and dark discoloration that patients describe as unbearable within the first 30–60 minutes of injury.
The discoloration progresses from bright red to dark red to purple/black as the blood clots and oxidizes. The degree of pain correlates with pressure — small hematomas may be almost painless while large ones involving the majority of the nail bed are intensely throbbing.
When Does a Black Toenail Need Treatment?
Not every subungual hematoma requires draining. Indications for trephination (drainage) include:
- Hematoma involving greater than 25–50% of the nail surface area
- Significant throbbing pain — pain out of proportion to appearance
- Acute presentation within 24–48 hours of injury (blood is still liquid)
- Evidence of nail separation from the nail bed
Small, minimally painful hematomas (<25% nail surface) in an otherwise healthy nail can be observed — the blood will reabsorb over 6–12 weeks as the nail grows out. The nail may still turn black and eventually separate (onycholysis), but this is cosmetic and self-resolving.
Trephination: Draining the Hematoma
Trephination involves creating a small drainage hole through the nail plate using an electrocautery device (heated wire tip) or a hand drill (battery-powered nail trephine). The procedure is performed after the nail surface is cleaned; local anesthesia is typically not required because the nail plate has no nerve supply — only the nail bed underneath does, and the blood under pressure buffers contact with sensitive tissue in most cases.
As the hole is created, blood escapes under pressure — often dramatically — immediately relieving the throbbing pain. The drainage hole is kept open by gently expressing remaining blood, and a sterile dressing is applied. Patients routinely report the pain drops from a 9/10 to a 1/10 within seconds of drainage. The procedure takes under 5 minutes.
After trephination, the nail may still eventually separate from the nail bed as the hematoma resolves and the nail bed heals — new nail growth typically replaces it over 6–9 months for a toenail.
When Is Nail Avulsion Needed?
Nail avulsion (removal of the nail plate) is indicated when:
- The nail plate is partially or completely detached from the nail bed after trauma
- Underlying nail bed laceration requires direct inspection and repair with fine suture
- The nail is fractured or shattered and cannot be preserved
- An associated distal phalanx fracture with nail avulsion is present (often an open fracture requiring thorough irrigation)
- The nail has become chronically ingrown and the nail border requires permanent removal (partial nail avulsion with phenol matrixectomy)
Partial nail avulsion involves removing the affected nail border and applying phenol (acid) to the nail matrix to permanently prevent regrowth of that nail segment — the same procedure used for chronic ingrown toenails. Total nail avulsion removes the entire nail plate; the nail will regrow over 9–12 months (toenail) or 4–6 months (fingernail).
Runner’s Black Toenail
Distance runners, hikers, and trail runners commonly develop subungual hematomas from repetitive microtrauma — the nail repeatedly striking the toe box of the shoe with each forefoot contact over miles and hours. The 2nd toe is most commonly affected (often the longest), followed by the hallux.
Prevention focuses on proper shoe fitting: shoes should have a thumbnail’s width (12–15mm) of space between the longest toe and the front of the shoe box, particularly for downhill running or hiking where the foot slides forward. Slightly shorter nails, moisture-wicking socks to reduce sock bunching, and lacing techniques that secure the heel and prevent forward slide all reduce nail trauma. Toenail-specific products like toe guards and athletic toe tape provide additional protection for athletes prone to this problem.
Is a Black Toenail Ever Serious?
Most black toenails are straightforward traumatic hematomas. However, a dark lesion under the nail without a clear history of trauma — particularly a brown or black streak running longitudinally from the nail base — warrants urgent evaluation. Subungual melanoma (nail unit melanoma) is rare but occurs and can mimic a hematoma. It does not grow out with the nail or resolve over weeks. Any pigmented nail lesion without an obvious traumatic etiology should be examined by a physician promptly. Dr. Biernacki evaluates pigmented nail lesions and refers to dermatology for biopsy when malignancy cannot be excluded clinically.
Dr. Tom's Product Recommendations
Injinji Toe Socks — Running Compression
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Best for: Distance runners, trail runners, hikers prone to runner’s black toenail
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Applied to the nail bed after a hematoma resolves and the nail plate separates, this antifungal solution protects the vulnerable exposed nail bed and regrowing nail from opportunistic fungal infection — a common secondary complication after nail trauma.
Dr. Tom says: “”My podiatrist recommended applying this to my nail bed after my black toenail fell off. The new nail grew back completely healthy.””
Best for: Post-hematoma nail bed protection during regrowth, preventing secondary fungal nail infection
Not ideal for: Active wound care during the acute hematoma phase
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Best for: Post-nail avulsion nail bed protection, traumatic nail loss recovery
Not ideal for: Active nail infections — treat infection first before mechanical protection
Disclosure: We earn a commission at no extra cost to you.
✅ Pros / Benefits
- Trephination provides dramatic immediate pain relief in under 5 minutes with no local anesthesia needed in most cases
- Runner’s black toenail is almost entirely preventable with proper shoe fitting and sock selection
- Nail avulsion is a definitive treatment for detached traumatic nails and chronic ingrown nails
❌ Cons / Risks
- Even after trephination, the nail typically separates over 4–8 weeks and requires 6–9 months to fully regrow
- A dark nail streak without trauma history requires urgent evaluation to rule out subungual melanoma
- Post-avulsion nail bed is vulnerable to secondary fungal infection — prophylactic antifungal application is recommended
Dr. Tom Biernacki’s Recommendation
Subungual hematomas are one of the most gratifying emergency treatments in our office because the relief is immediate and total. Patients come in with a throbbing, purple, excruciating nail and they leave 10 minutes later completely comfortable. The key decision point is identifying whether there’s an underlying nail bed laceration or fracture — because those need more than just trephination. And I always check a painless dark streak under the nail carefully for the classic history: no trauma, slowly progressing over weeks or months, not growing out. That’s the one you don’t want to miss.
— Dr. Tom Biernacki, DPM | Board-Certified Podiatric Surgeon | Balance Foot & Ankle
Frequently Asked Questions
Can I drain my own black toenail at home?
Home trephination is not recommended. Achieving a clean through-nail hole without burning the nail bed requires precise control of temperature (with cautery) or drill pressure. Improperly done, you can burn the sensitive nail bed, create an infection entry point, or drive bacteria into the nail bed with a contaminated tool. Professional in-office trephination takes under 5 minutes, is essentially painless, and prevents complications.
How long does it take for a nail to grow back after avulsion?
Toenails grow approximately 1–2mm per month, so a full toenail takes 9–12 months to regrow completely from the nail matrix after total avulsion. The hallux (big toenail) takes longest; smaller toenails average 6–9 months. The newly forming nail is initially soft and translucent and gradually thickens and hardens. Fingernails grow faster at 2–4mm/month, with complete regrowth in 4–6 months.
Should I remove my toenail if it’s black from running?
Not necessarily. A runner’s black toenail that is attached (not lifting from the bed) and not very painful can often be managed conservatively — allowing the nail to grow out and eventually separate on its own. If the nail is very painful (high-pressure hematoma) or the nail plate is already separating, trephination or assisted removal of the detached portion prevents ongoing friction trauma and reduces infection risk. Dr. Biernacki makes this determination at evaluation.
When should I be concerned that a dark nail might be cancer?
Seek evaluation for any dark nail streak (melanonychia) that appears without a clear injury event, has been present for more than 4–6 weeks, is progressively enlarging or darkening, extends onto the nail folds (Hutchinson’s sign), or is accompanied by nail distortion. Subungual melanoma is rare but is real — it is among the most missed diagnoses in dermatology because it’s assumed to be traumatic. Toenail melanoma most commonly involves the hallux.
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How long does it take a toenail to grow back?
6-12 months for a full big toenail. Smaller toenails 4-6 months. Speed varies with age, circulation, and nutrition.
Will this affect other nails?
Trauma affects only the injured nail. Fungal infection can spread without treatment. Systemic causes affect multiple nails simultaneously.
Should I cover the nail or leave it open?
Cover with a breathable bandage during work or activity. Leave open at night for healing. Keep dry and clean.
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 Black Toenail Recovery Protocol
- Doctor Hoy’s Natural Pain Relief Gel — Subungual hematoma pain and periungual inflammation: arnica + camphor gel applied to the skin surrounding the affected nail reduces the throbbing inflammatory response while blood reabsorbs under the nail plate. (30% commission)
- FLAT SOCKS No-Sock Insoles — Protecting a damaged or avulsed nail during regrowth: FLAT SOCKS no-sock inserts create a smooth, friction-reducing barrier between the vulnerable nail bed and shoe upper throughout the 3-6 month nail regrowth period. (30% commission)
- PowerStep Pinnacle — Recurrent black toenail from shoe box impact: arch support reduces the downhill gait loading that drives the hallux into the toe box — the primary mechanical cause of recurring subungual hematoma in runners and hikers. (30% commission)
Black toenail from crush injury, with nail bed laceration, or signs of infection? Same-day nail evaluation and drainage at Balance Foot & Ankle. Balance Foot & Ankle → (810) 206-1402
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