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Article
June 1943

DEMODEX FOLLICULORUM: ITS INCIDENCE IN ROUTINE HISTOLOGIC STUDY OF THE SKIN

Author Affiliations

PHILADELPHIA

Fellow in dermatology and syphilology in the University of Pennsylvania School of Medicine.

From the Laboratory of Dermatologic Research, University of Pennsylvania School of Medicine.

Arch Derm Syphilol. 1943;47(6):793-796. doi:10.1001/archderm.1943.01500240033005
Abstract

Demodex folliculorum has been suggested as a pathogen by several authors, particularly by Lawrence,1 Ayres2 and Ayres and Anderson.3 Their views are not accepted without reservation by all dermatologists. These investigators admit that this arachnid occurs almost universally in small numbers in the hair follicles and sebaceous ducts of adult human beings and that under ordinary conditions it is apparently satisfied with the role of a scavenger. Since the mere factor of incidence of a micro-organism can scarcely determine whether or not it is pathogenic, the data to follow are not to be construed as pointing one way or the other.

The material utilized in this study consisted of 1,750 specimens of cutaneous tissue (obtained for biopsy or at necropsy) and routinely submitted for histologic diagnosis in this laboratory. In each instance the diagnosis of the mite was based on appearances which, once learned, are characteristic and

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