Overview
Subungual keratoacanthoma is a rare, benign, well-demarcated squamous cell neoplasm that arises beneath the nail plate, often mimicking more aggressive conditions like melanoma. 2Diagnosis
Clinical Presentation: Presence of a firm, dome-shaped nodule under the nail with a keratotic plug.
Hutchinson's Sign: Pigmentation around the nail bed can indicate subungual melanoma, though not specific to keratoacanthoma. 2
Histopathology: Characterized by parakeratotic, hyperkeratotic epidermis with a crater-like appearance and palisading granulomatous inflammation.
Differentiation: Distinguishing from subungual melanoma is crucial; histopathological examination is definitive.Management
Surgical Excision: Complete removal of the lesion with clear margins is the primary treatment.
Nail Bed Repair: Reconstruction of the nail bed may be necessary post-excision to restore nail function.
Antibiotic Prophylaxis: No evidence supports routine antibiotic prophylaxis post-excision for subungual keratoacanthoma 1.Special Populations
Pregnancy: Specific management guidelines for pregnant patients are not addressed in the provided abstracts.
Pediatrics: No specific considerations mentioned in the abstracts.
Elderly: No unique considerations noted in the abstracts.
Comorbidities: Management principles remain consistent regardless of comorbidities, though individual patient factors should guide care.Key Recommendations
Perform surgical excision with clear margins for definitive treatment of subungual keratoacanthoma (Evidence: Expert opinion 2).
Avoid routine antibiotic prophylaxis post-excision due to lack of supporting evidence (Evidence: Weak 1).
Histopathological examination is essential for accurate diagnosis and differentiation from subungual melanoma (Evidence: Expert opinion 2).References
1 Costello J, Howes M. Best evidence topic report. Prophylactic antibiotics for subungual haematoma. Emergency medicine journal : EMJ 2004. link
2 Mikhail GR. Hutchinson's sign. The Journal of dermatologic surgery and oncology 1986. link