Skin inflammatory (nontumor)

Author: Mowafak Hamodat, M.D., MB.CH.B, MSc., FRCPC

Revised: 13 August 2018, last major update June 2011

Copyright: (c) 2002-2018,, Inc.

PubMed Search: Demodex [title] skin

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Cite this page: Hamodat, M. Demodex. website. Accessed January 22nd, 2019.
Definition / general
  • Mites are commonly present in inflamed follicles, but are usually nonpathogenic (Wikipedia)
  • Common in dogs
  • Common in basal cell carcinomas removed from the eyelids
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 extra-follicular Demodex, usually in granulomatous or pustular rosacea
  • May see telangiectasia of superficial vessels, perifollicular granuloma and mild perivascular chronic inflammation
Microscopic (histologic) images

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Contributed by Bobbi Pritt, M.D.

Toe nail of elderly
Florida woman -
KOH Calcofluor

Adult form has 8 legs, typical of arachnids, not insects

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Demodex mite