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Favus - Hair and Scalp
Other Resources UpToDate PubMed

Favus - Hair and Scalp

Contributors: Laurie Good MD, Whitney A. High MD, JD, MEng, Susan Burgin MD
Other Resources UpToDate PubMed

Synopsis

Favus (tinea favosa), a Latin word meaning honeycomb, is a severe form of tinea capitis caused most often by Trichophyton schoenleinii. Occasionally, Trichophyton violaceum or Microsporum species may cause a similar condition.

While favus used to occur worldwide, vast improvements in socioeconomic conditions have limited it to areas where the population suffers from poor hygiene and malnutrition. Currently, favus is mostly seen in Africa, some parts of Asia and the Middle East, and some parts of Eastern Europe; it is rarely encountered in the United States or Western Europe. Typically, scalp favus is acquired during childhood through close contact with other affected individuals. Combs and hairbrushes remain an important source of infection.

Scalp favus presents first as erythematous papules surrounding intact hair follicles. The papules become more inflamed and eventually develop characteristic thick, yellow-brown crusts composed of hyphae and keratin debris, resembling a honeycomb. T schoenleinii is an endothrix (residing within the hair shaft), and it destroys the hair shaft, eventuating in hair loss. Left untreated, concave, cup-shaped debris (termed scutula) steadily engulf ever more hair, leading to a progressive scarring alopecia.

Codes

ICD10CM:
B35.9 – Dermatophytosis, unspecified

SNOMEDCT:
85375000 – Tinea favosa

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Last Reviewed:08/15/2019
Last Updated:09/08/2019
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Favus - Hair and Scalp
A medical illustration showing key findings of Favus : Scalp, White scaly plaque, Focal scarring alopecia
Clinical image of Favus - imageId=2213445. Click to open in gallery.  caption: 'Diffuse thick, whitish, yellowish and light brown concretions, crusting, and interspersed hair loss on the scalp.'
Diffuse thick, whitish, yellowish and light brown concretions, crusting, and interspersed hair loss on the scalp.
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