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Is demodex really non-pathogenic?

G P Pena1, J S Andrade Filho

  • 1Laboratório Distrital Centro-Sul, Prefeitura de Belo Horizonte, Minas Gerais, Brasil. gilpena@gold.com.br

Revista Do Instituto De Medicina Tropical De Sao Paulo
|July 11, 2000
PubMed
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Demodex folliculorum mites, often considered harmless, can cause rare skin damage like granulomatous inflammation. This case highlights the parasite's potential pathogenicity despite its common occurrence.

Area of Science:

  • Dermatology
  • Parasitology
  • Histopathology

Background:

  • Demodex folliculorum is typically viewed as a non-pathogenic skin mite.
  • However, it has been anecdotally linked to dermatological conditions like rosacea and blepharitis.
  • Tissue damage directly attributed to Demodex infestation is considered rare despite high prevalence.

Observation:

  • A case study of a 38-year-old woman presenting with rosacea-like papular lesions on her cheek.
  • Histopathological examination was performed on the affected tissue.
  • The examination aimed to identify the cause of the lesions.

Findings:

  • Histopathology revealed granulomatous dermal inflammation.
  • A well-preserved Demodex mite was observed within a multinucleated giant cell.

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  • This indicated the host's immune response to the parasite.

    • Implications:

    • The findings provide evidence for the pathogenicity of Demodex folliculorum.
    • It raises questions about the mechanisms underlying the parasite's ability to cause disease.
    • This challenges the traditional view of Demodex as solely non-pathogenic.