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Published on: December 15, 2011

Childhood tinea incognito caused by Trichophyton mentagrophytes var. interdigitale mimicking pustular psoriasis

Yoshio Kawakami1, Noritaka Oyama1, Erika Sakai1

  • 1Department of Dermatology, Fukushima Medical University School of Medicine, Fukushima, Japan.

Pediatric Dermatology
|March 23, 2011
PubMed

Insights

Tinea incognito, a fungal infection altered by corticosteroids, presented as pustular psoriasis. Trichophyton mentagrophytes var. interdigitale was identified as the causative agent using genetic sequencing.

Area of Science:

  • Dermatology
  • Mycology
  • Medical Mycology

Background:

  • Tinea incognito describes fungal infections where clinical presentation is altered by corticosteroid use.
  • Corticosteroids can mask or worsen the symptoms of superficial fungal infections.

Observation:

  • A case of pustular psoriasis-like tinea incognito is presented.
  • The condition was caused by Trichophyton mentagrophytes var. interdigitale.

Findings:

  • Topical corticosteroid therapy aggravated the fungal infection, leading to a pustular psoriasis-like appearance.
  • Molecular identification using internal transcribed spacer 2 and D1D2 domain sequencing confirmed the fungal species.

Implications:

  • Accurate identification of fungal species is crucial for effective treatment of tinea incognito.
  • Understanding the impact of corticosteroids on fungal infections aids in diagnosis and management.
  • Genetic sequencing provides a reliable method for identifying dermatophytes causing atypical presentations.

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