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May 1961

Demodectic Eruptions (Demodicidosis) in the Human: 30 Years' Experience with 2 Commonly Unrecognized Entities: Pityriasis Folliculorum (Demodex) and Acne Rosacea (Demodex Type)

Author Affiliations


Arch Dermatol. 1961;83(5):816-827. doi:10.1001/archderm.1961.01580110104016

A recent incident, which forcefully emphasized the nonrecognition by many dermatologists of an entity which the authors regard as not uncommon, prompted the presentation of this paper.

At the Dermatological Staff Meeting of the Los Angeles County General Hospital held in June, 1959, a 44-year-old white woman was presented with a diagnosis of rosacea-like tuberculide of Lewandowsky. The history, including antituberculous treatment and the description of the eruption, ending with the statement that "diascopy produces a reddish-brown color," invited a diagnosis of some type of cutaneous tuberculosis.

When the authors examined the patient, they were struck with the characteristic appearance of a familiar entity, pityriasis folliculorum (Demodex). Close inspection revealed a diffuse flushing of the face, which had a dry nutmeg grater appearance caused by follicular plugging with fine white scales, best seen under cross-lighting with magnification. One might also liken the appearance to that seen after spraying the face