Emergency Department Management of Suspected Subungual Melanoma
Do not attempt biopsy in the emergency department—immediately refer the patient to a surgeon experienced in nail unit biopsies or a multidisciplinary skin cancer team for definitive diagnosis and management. 1
Immediate Actions in the ED
Clinical Assessment
- Document the lesion thoroughly with clinical photography if available 2
- Examine for specific high-risk features:
- Perform full skin examination for additional suspicious lesions
- Examine regional lymph nodes (axillary for hand, inguinal for foot) for palpable adenopathy 4
Critical Pitfall to Avoid
Subungual melanoma is frequently misdiagnosed as trauma, subungual hematoma, paronychia, or onychomycosis 5, 6, 7. The mean delay from symptom onset to diagnosis is 2.2 years 8. Do not dismiss pigmented nail lesions as benign, especially in patients over 50 years old.
Referral Protocol
Urgent Specialist Referral Required
Refer immediately to:
- Hand surgeon or orthopedic surgeon with nail unit expertise, OR
- Dermatologist with pigmented lesion specialization, OR
- Multidisciplinary skin cancer team 2, 1, 2
The referral should be seen within 2 weeks maximum 4
Why ED Providers Should Not Biopsy
The guidelines are explicit that biopsies of suspected subungual melanomas must be performed only by surgeons regularly performing nail unit procedures 2, 4. This is because:
- Complex nail anatomy requires specialized technique: The melanoma arises from the nail matrix, which must be adequately sampled 1
- The nail plate must be sufficiently removed to expose the underlying lesion 1
- Inadequate sampling leads to misdiagnosis and incorrect staging, directly impacting survival 2
- Incisional or excisional biopsy technique depends on lesion size and requires expertise to determine 1
Biopsy Technique (For Specialist Reference)
When the specialist performs the biopsy:
- Remove the nail plate sufficiently to expose the lesion
- Sample the nail matrix adequately (where melanoma originates)
- Perform excisional biopsy if lesion is small, or incisional biopsy for larger lesions 1
- Biopsy any clinically obvious tumor if present 2
Patient Communication
Inform the patient that:
- This lesion requires evaluation by a specialist due to concern for melanoma
- Subungual melanoma is rare but serious, with the thumb and great toe being most commonly affected 8, 3
- Early diagnosis is critical—subungual melanoma has the highest mortality among skin cancers when diagnosed late 7
- The specialist will determine if biopsy is needed and perform it with appropriate technique
Documentation Requirements
Document in the ED chart:
- Detailed description of the lesion (size, color, location, nail changes)
- Presence or absence of Hutchinson's sign
- Duration of symptoms if known
- Any history of trauma (but do not let trauma history dismiss melanoma concern)
- Regional lymph node examination findings
- Urgent referral placed and to whom
The key principle: Subungual melanoma diagnosis requires specialized surgical expertise that is not appropriate for emergency department management—your role is recognition and urgent referral. 2, 1, 2, 1