Last Updated: 2023-07-07

Author(s): Anzengruber F., Navarini A.

ICD11: -

  • Gruby, 1841
  • Sabouraud, 1892

Gruby's disease, Porrigo decalvans.

Special form of tinea capitis.

Endemics can occur especially in kindergartens and schools.

  • Pathogen: M. canis, gypseum, audouinii, ferrugineum (zoophilia)
  • Transmission occurs via a contaminated animal (usually cat or dog). The infection is highly contagious and can spread to the entire integument.

Erythematous, slow-growing, scaly plaques, often raised at the edges.

  • Clinic
  • Detection of pathogens (epilation of hair or recovery of dandruff: then native preparation and culture; biopsy)
  • Wood light (greenish fluorescence)

  1. Ginarte, et al., Case Reports. Pityriasis amiantacea as manifestation of tinea capitis due to Microsporum canis. Mycoses, 2000. 43(1-2): p. 93-96.
  2. Hamm, et al., Short duration treatment with terbinafine for tinea capitis caused byTrichophytonorMicrosporumspecies. British Journal of Dermatology, 1999. 140(3): p. 480-482.
  3. Ishizaki, S., et al., Tinea Faciei by Microsporum gypseum Mimicking Allergic Reaction following Cosmetic Tattooing of the Eyebrows. Medical Mycology Journal, 2012. 53(4): p. 263-266.
  4. Zink, A., et al., Outbreak of Microsporum audouinii in Munich--the return of infectious fungi in Germany. Mycoses, 2014. 57(12): p. 765-70.
  5. Treat, J. (2016). Tinea capitis. Uptodate.com. Retrieved 30 May 2016, from ttp://www.uptodate.com/contents/tinea-capitis?source=machineLearning&search=microsporum&selectedTitle=2~18&sectionRank=1&anchor=H949998314#H949998314