Skin nontumor



Topic Completed: 1 June 2011

Minor changes: 6 October 2020

Copyright: 2002-2021,, Inc.

PubMed Search: Demodex [title] skin

Mowafak Hamodat, M.B.Ch.B., M.Sc.
Page views in 2020: 2,651
Page views in 2021 to date: 2,818
Cite this page: Hamodat M. Demodex. website. Accessed October 15th, 2021.
Definition / general
  • Mites are commonly present in inflamed follicles but are usually nonpathogenic (Wikipedia: Demodex [Accessed 14 February 2019])
  • Common in dogs
  • Demodex folliculorum is also known as the follicle mite
  • Typically considered harmless
  • Common in basal cell carcinomas removed from the eyelids
Clinical features
Case reports
Microscopic (histologic) description
  • Follicular dilatation, the presence of dense homogenous eosinophilic material surrounding the mites, folliculitis and perifollicular chronic inflammation
  • Often is a granulomatous reaction to extrafollicular Demodex, usually in granulomatous or pustular rosacea
  • May see telangiectasia of superficial vessels, perifollicular granuloma and mild perivascular chronic inflammation
Microscopic (histologic) images

Contributed by Bobbi Pritt, M.D.

Toe nail of elderly
Florida woman -
KOH Calcofluor staining
of Demodex folliculorum

Adult Demodex
8 legs, typical of
arachnids, not insects

Demodex mite found in rosacea papule


Demodex mite

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