KERION as a clinical manifestation of dermatomycosis is described as a highly inflamed, boggy or carbunculoid lesion affecting chiefly the scalp of children or the bearded region of men. The commonest cause of kerion is Trichophyton mentagrophytes (Trichophyton gypseum) and several of its varieties. This is a fungus of animal origin, or of the zoophilic type as classified by Wise and Sulzberger.1 A number of genera and species of the dermatophytes both of the zoophilic and anthropophilic groups may produce kerion. Among these may be listed, in addition to T. mentagrophytes, the organisms Microsporum audouini, Microsporum canis, Microsporum gypseum (Microsporum fulvum), Trichophyton tonsurans (Trichophyton crateriforme), Trichophyton epilans (Trichophyton plicatile), Trichophyton violaceum, trichophyton of the niveum type and Achorion (Trichophyton) schoenleinii.
In addition to kerion of the beard of men, there may develop lesions on hairy arms, wrists or thighs which have all the characteristics of
MOORE M, WOOLDRIDGE WE. KERION CAUSED BY TRICHOPHYTON SULFUREUMReport of a Case. Arch Derm Syphilol. 1950;61(3):460–465. doi:10.1001/archderm.1950.01530100104013