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A 24-year-old woman presents with “itchy eyes” and you notice the above.

This most likely represents:

c -- an infection with Demodex

The mite Demodex spp., which belongs to class arachnida, order acarina, lives around hair follicles (Demodex folliculorum hominis) or in the secretory ducts of sebaceous (fat) glands connected to the hair follicles (Demodex brevis) of humans. The preferred sites are facial skin, forehead, cheeks, eyelashes and external ear channels. The size of demodices varies from 0.1 mm to 0.4 mm. The incidence of demodicosis steadily increases with the individual's age. The infestation may be frequently free of symptoms. However, suppurative or glanulomatous reactions and inflammation in acute and chronic forms may occur due to demodicosis in humans.