- A dictionary of medical eponyms

Simonea folliculorum (Karl Gustav Theodor Simon)

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Now obsolete term for Demodex folliculorum, also known as Acarus folliculorum. It is a mite that infests hair follicles. A harmless thing found in the hair follicles of almost every person, and in sebaceous secretions, especially of the face and nose. However, it is suspected that Demodex follicularum may cause rosacea when large numbers congregate in a single follicle.


  • K. G. T. Simon.
    Ueber eine in den kranken und normalen Haarsäcken des Menschen lebende Milbe.
    [Müller’s] Archiv für Anatomie, Physiologie und wissenschaftliche Medicin, Berlin, 1842: 218-239.
  • Die Hautkrankheiten durch anatomische Untersuchungen erläutert. 1848.

What is an eponym?

An eponym is a word derived from the name of a person, whether real or fictional. A medical eponym is thus any word related to medicine, whose name is derived from a person.

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