Demodex spp hair follicle mites

There are two species of mites in the genus Demodex parasitic on humans, namely, D. folliculorum (in the hair follicles) (Figure 23.6 and D. brevis (in the sebaceous glands). Most people harbour these mites in the face, particularly around the nose. Older persons are more often infested than younger ones. The medical importance of the presence of Demodex is difficult to assess but most infestations appear to be benign and of no or little pathological significance. In rare cases, these mites are thought to be involved in the loss of eye-lashes and in granulomatous acne (Alexander 1984; Varma 1993).

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