Follicle mite nymph. Coloured scanning electron micrograph (SEM) of a follicle or eyelash mite nymph (Demodex folliculorum). This harmless parasite lives inside human hair follicles (depressions in the skin containing the roots of hairs). Up to 25 nymphs hatch in a single follicle, develop into adults, then mate and enter new follicles. The mites infest the skin of the eyelids, nose and ear canals, feeding on oily secretions from the skin's sebaceous glands, as well as dead skin cells. Infestation is usually symptomless, but allergic reactions to the mites in susceptible individuals can cause hair loss and acne. Magnification: x820 at 6x7cm size.

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