Skin inflammatory (nontumor)
Infestations
Demodex

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

Revised: 13 August 2018, last major update June 2011

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

PubMed Search: Demodex [title] skin

Cite this page: Hamodat, M. Demodex. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/skinnontumordemodex.html. Accessed October 20th, 2018.
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
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

Images hosted on PathOut server:

Contributed by Bobbi Pritt, M.D.

Toe nail of elderly
Florida woman -
KOH Calcofluor
staining

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



Images hosted on other servers:

Demodex mite