The paper describes a case of a rare opportunistic infection, such as skin lesion caused by achlorophyllic unicellular algae of the genus Prototheca. It provides a detailed pathologic description of the foci of cutaneous protothecosis, such as pandermal inflammatory infiltrate, granulomas, pseudoepitheliomatous hyperplasia, and intraepidermal abscesses. Criteria for pathogen detection in histological sections are given.
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