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ContentsSynopsisCodesLook ForDiagnostic PearlsDifferential Diagnosis & PitfallsBest TestsManagement PearlsTherapyReferencesView all Images (3)
Superficial onychomycosis in Child
See also in: Nail and Distal Digit
Print
Other Resources UpToDate PubMed

Superficial onychomycosis in Child

See also in: Nail and Distal Digit
Print Images (3)
Contributors: Shari Lipner MD, PhD, Jeff Mailhot MD, Nikki Levin MD, Susan Burgin MD
Other Resources UpToDate PubMed

Synopsis

Superficial onychomycosis is a type of fungal nail infection in which the infecting organism invades the upper surface of the nail plate. It usually presents with superficial white patches on the nail plate. Less commonly, it may appear in a transverse striate or invasive pattern. Rarely, it can also have a black color. The scale can often be scraped off with a blade for diagnostic purposes. The most common organisms responsible for the patchy form are Trichophyton rubrum, Trichophyton mentagrophytes, Fusarium, and Acremonium. In the transverse form, Scytalidium, T. rubrum, and Fusarium are often isolated.

Onychomycosis affects up to 14% of the US population. Superficial onychomycosis is a rare subtype that is estimated to account for 1.5%-7% of cases of onychomycosis.

Superficial onychomycosis is usually seen in adults, and it is more common in immunocompromised patients, including those with human immunodeficiency virus (HIV)-infection, those with diabetes, and the elderly. Risk factors for onychomycosis and tinea pedis include hyperhidrosis, wearing occlusive footwear, and walking barefoot through public shower areas, such as in locker rooms.

Superficial white onychomycosis is generally asymptomatic, but may become painful or have a negative effect on quality of life in untreated cases. There is a high association with tinea pedis (athlete's foot), which may be pruritic. Often the initial presentation will be tinea pedis that progresses to onychomycosis over a course of weeks to months.

Pediatric Patient Considerations:
Superficial onychomycosis is rare in children.

Immunocompromised Patient Considerations:
Superficial onychomycosis is associated with an immunocompromised state, particularly HIV-infection.

Codes

ICD10CM:
B35.1 – Tinea unguium

SNOMEDCT:
417583002 – Superficial white onychomycosis

Look For

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Diagnostic Pearls

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Differential Diagnosis & Pitfalls

  • Distal subungual onychomycosis – Onycholysis and subungual hyperkeratosis. T. rubrum is often the causative agent.
  • Proximal subungual onychomycosis – Look for nail plate involvement of the proximal nail; often caused by T. rubrum. Other organisms are Fusarium, Candida albicans, and Aspergillus. May be a presenting sign of HIV infection.
  • Candida onychomycosis – Look for massive hyperkeratosis of the nail bed, nail plate destruction, and paronychia (periungual redness and swelling). Most commonly caused by C. albicans and seen in patients with chronic mucocutaneous candidiasis.
  • Psoriasis – Look for nail pitting, oil spots, and skin involvement with psoriasis.
  • Lichen planus – Look for atrophic nails, pterygium, and skin findings of lichen planus.
  • Eczematous dermatitis – Look for a history of eczema, diffuse itching of the hands.
  • Subungual verruca – Look for evidence of a verrucous papule under the nail.
  • Nail squamous cell carcinoma – A biopsy may be necessary to rule out this entity.

Best Tests

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Management Pearls

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Therapy

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References

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Last Reviewed: 08/30/2017
Last Updated: 10/04/2017
Copyright © 2018 VisualDx®. All rights reserved.
Superficial onychomycosis in Child
See also in: Nail and Distal Digit
Print 3 Images
View all Images (3)
(with subscription)
Superficial onychomycosis : Toenails, Transverse white nail lines, Yellow color, Leukonychia, Immunocompromised
Clinical image of Superficial onychomycosis
Copyright © 2018 VisualDx®. All rights reserved.