Demodicidosis or rosacea: what did we treat?

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Abstract
We report a 75-year-old man with a fulminant rosacea-like eruption, suggestive of demodicidosis. Multiple Demodex folliculorum mites were found in facial scales and pustules and, on histological examination, in the infundibulum of pilosebaceous follicles and in the dermis. Intradermal mites were surrounded either by polymorphonuclear granulocytes and histiocytes, or by a granulomatous infiltrate containing foreign-body giant cells, which had phagocytosed the parasites. Complete recovery, with disappearance official mites, was achieved by treatment with a combination of oral and topical metronidazole, although this drug is not known to be miticidal.

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