Quick answer: Subungual Melanoma Awareness Toenail is a common nail condition with multiple causes including trauma, fungal infection, biomechanical pressure, and underlying medical conditions. Treatment depends on the cause: trauma resolves as the nail grows out (6-12 months), fungus needs antifungal therapy, and biomechanical issues need shoe and orthotic correction. Call (810) 206-1402.
Medically reviewed by Dr. Tom Biernacki, DPM · Board-Certified Podiatric Surgeon · Last reviewed: April 2026 · Editorial Policy
The most important clinical decision with Subungual Melanoma Awareness Toenail isn’t which treatment to start with — it’s identifying the correct subtype. That changes everything. Call (810) 206-1402.
Quick Answer
Subungual Melanoma: Dark Streak Under Toenail When to Worry relates to toenail conditions — typically caused by fungal infection or trauma. Most patients improve in 6-12 months for nail regrowth with conservative care. Same-week appointments in Howell + Bloomfield Hills: (810) 206-1402.
Medically reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatric Surgeon — Balance Foot & Ankle, Howell & Bloomfield Hills, MI. Last updated April 2026.
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Medically Reviewed by Dr. Tom Biernacki, DPM — Board-Certified Podiatrist, Balance Foot & Ankle Specialists, Michigan. Last updated April 2026.
A dark streak or band under the toenail — longitudinal melanonychia — causes significant patient anxiety and, in most cases, is benign: caused by nail matrix activation (trauma, friction, certain medications, Addison’s disease) rather than malignancy. However, subungual melanoma — melanoma arising in the nail matrix — is the most dangerous misdiagnosis in podiatric and dermatologic practice. It is frequently misdiagnosed as a benign hematoma or fungal discoloration, leading to delays in diagnosis that dramatically worsen prognosis. At Balance Foot & Ankle in Southeast Michigan, Dr. Tom Biernacki evaluates pigmented nail lesions with a ABCDEF criteria and refers for biopsy whenever clinical suspicion warrants.
Benign Causes of Dark Streaks Under the Toenail
Subungual hematoma (most common): blood under the nail from trauma — stubbed toe, dropping something on the foot, tight shoes during running. The discoloration moves distally as the nail grows; typically dark purple-black rather than brown; transillumination shows fluid/blood. Nail matrix melanocyte activation: benign longitudinal melanonychia from friction (most common in hallux and 5th toenail), prior nail injury, certain medications (hydroxyurea, chemotherapy, antimalarials, AZT), or hormone changes. Fungal infection: toenail fungus occasionally produces brownish-black discoloration — KOH and culture distinguish fungal from pigmented lesions. Ethnic/racial pigmentation: longitudinal melanonychia is common in darker skin types (present in up to 70% of African Americans over age 50) and is usually benign. The key: benign melanonychia bands are typically regular, homogeneous in color, and do not change rapidly.
ABCDEF Warning Signs of Subungual Melanoma
The ABCDEF criteria for subungual melanoma: A — Age (peak incidence 5th–7th decade) and African American, Asian, or Native American (subungual melanoma represents a higher proportion of all melanomas in darker skin types — do not dismiss because the patient is non-Caucasian); B — Band color: heterogeneous brown-black with irregular borders (benign bands are typically homogeneous); B2 — Breadth ≥3mm; C — Change in the band over time (growing, changing color, irregular edges appearing); D — Digit involved (thumb, big toe, and index finger are the most common sites for subungual melanoma — any pigmented band on the hallux or thumb deserves higher scrutiny); E — Extension of pigmentation to the proximal or lateral nail fold (Hutchinson’s sign) — the most reliable clinical sign of subungual melanoma; F — Family or personal history of melanoma, dysplastic nevi, or history of multiple biopsies for atypical nevi. Any of these signs warrants urgent dermatology referral and biopsy consideration. Missing subungual melanoma has catastrophic consequences — 5-year survival drops from 85% for early-stage to below 30% for advanced-stage.
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When to See a Podiatrist
If foot or ankle pain has been bothering you for more than a few weeks, home care alone may not be enough. Balance Foot & Ankle offers same-week appointments at our Howell and Bloomfield Hills clinics — no referral needed in most cases. Bring your current shoes and a short list of symptoms and we’ll build you a treatment plan in one visit.
Call Balance Foot & Ankle: (810) 206-1402 · Book online · Offices in Howell & Bloomfield Hills
Frequently Asked Questions
How do I know if a dark streak under my toenail is melanoma?
Clinical features that raise concern for subungual melanoma: the band is ≥3mm wide, has irregular or fuzzy borders, is heterogeneous in color (mixture of browns and blacks), is getting wider or darker over weeks to months, involves the big toe or thumb, extends onto the skin of the nail fold (Hutchinson’s sign), or there is personal or family history of melanoma. A dark streak from a specific traumatic event that is moving distally with nail growth is almost always a benign hematoma. Any uncertainty warrants evaluation — subungual melanoma is too serious to monitor without clinical assessment. See a podiatrist or dermatologist for any unexplained pigmented band under the toenail.
Is subungual melanoma common?
Subungual melanoma accounts for approximately 1–3% of all melanomas in Caucasians, but 15–20% of melanomas in darker-skinned populations (African Americans, East Asians, Native Americans). It is uncommon but carries an outsized risk of delayed diagnosis — often mistaken for hematoma or fungal infection for months to years. In one study, the average time from symptom onset to correct diagnosis was 2.5 years. The big toe is the most common site (accounting for approximately 80% of subungual melanomas of the foot). Regular foot inspection, including the nails, is part of an annual diabetic foot exam and is recommended for all patients by the American Podiatric Medical Association.
What happens if subungual melanoma is suspected?
If subungual melanoma is clinically suspected based on ABCDEF criteria, the next step is nail matrix biopsy — a procedure performed under local digital block anesthesia by a dermatologist or podiatric surgeon. The nail plate is partially or completely reflected, and a punch or shave biopsy of the nail matrix and nail bed is taken. Histopathology confirms the diagnosis. If melanoma is confirmed, staging (sentinel lymph node biopsy, PET-CT) and treatment planning involve dermatologic oncology. Early diagnosis — at stage I — has a 5-year survival of approximately 85%. This is why any concerning pigmented nail lesion should be evaluated promptly rather than observed for months.
A dark streak under the toenail deserves prompt evaluation. Contact Balance Foot & Ankle in Southeast Michigan for same-week nail evaluation with Dr. Biernacki.
Dr. Tom’s Recommended Products for Toenail Problems
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Howell Office
4330 E Grand River Ave
Howell, MI 48843
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Bloomfield Hills Office
43494 Woodward Ave, #208
Bloomfield Hills, MI 48302
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Book Your AppointmentPros & Cons of Conservative Care for toenail conditions
Advantages
- ✓ Most cases resolve at home
- ✓ Same-week appointments available
- ✓ Permanent fix exists
Considerations
- ✗ Recurrence common without prevention
- ✗ Diabetics need professional care
Dr. Tom’s Recommended Products for toenail conditions
Affiliate disclosure: As an Amazon Associate, Balance Foot & Ankle earns from qualifying purchases. We only recommend products we use with patients.
Tolcylen Antifungal Solution Dr. Tom’s Pick
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About Your Care Team at Balance Foot & Ankle
Dr. Tom Biernacki, DPM · Board-Certified Foot & Ankle Surgeon. Specializes in conservative-first care, minimally invasive bunion surgery, and complex reconstruction.
Dr. Carl Jay, DPM · Accepting new patients. Specializes in sports medicine, athletic injuries, and routine podiatric care.
Dr. Daria Gutkin, DPM, AACFAS · Accepting new patients. Specializes in surgical reconstruction and pediatric podiatry.
Locations: 4330 E Grand River Ave, Howell, MI 48843 · 43494 Woodward Ave Suite 208, Bloomfield Hills, MI 48302
Hours: Mon–Fri 8:00 AM – 5:00 PM · (810) 206-1402
In-Office Treatment at Balance Foot & Ankle
If home treatment isn’t providing relief for your foot and ankle conditions, our podiatry team at Balance Foot & Ankle can help with same-day evaluations and advanced in-office care.
Same-day appointments available. (810) 206-1402
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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.
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.
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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.