Skin-nontumor / Clinical dermatology
Infestations
Demodex

Author: Mowafak Hamodat, M.D., MB.CH.B, MSc., FRCPC (see Authors page)

Revised: 2 June 2016, last major update June 2011

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PubMed Search: Demodex

Cite this page: Demodex. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/skinnontumordemodex.html. Accessed December 7th, 2016.
Definition / General
  • Mites are commonly present in inflamed follicles, but are usually nonpathogenic (Wikipedia)
  • Common in dogs
Epidemiology
  • Common in basal cell carcinomas removed from the eyelids
Micro Description
  • Follicular dilatation, the presence of dense homogenous eosinophilic material surrounding the mites, folliculitis and perifollicular chronic inflammation
  • Often is a granulomatous reaction to extra-follicular Demodex, usually in granulomatous or pustular rosacea
  • May see telangiectasia of superficial vessels, perifollicular granuloma and mild perivascular chronic inflammation
Micro Images

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Demodex mite