title: Demodicosis and rosacea: epidemiology and significance in daily dermatologic practice.
abstract: BACKGROUND
  Demodicoses are thought to be rare, occurring mainly for patients with immunosuppression.
  
  
  OBJECTIVE
  We sought to demonstrate the high frequency of demodicoses and the overlapping with papulopustular rosacea (PPR) .
  
  
  METHODS
  We conducted a prospective epidemiologic study among 10 dermatologists. High Demodex density (Dd) was confirmed by standardized skin surface biopsy.
  
  
  RESULTS
  In all, 4372 diagnoses, in which 115 were demodicoses, were collected among 3213 patients. Demodicosis was the 9th most frequent diagnosis (13th new). Each dermatologist observed an average of 2.4 demodicoses a week (1.2 new). The proportion of demodicoses varied greatly according to the dermatologist. The general status was good in 110 patients; only 3 had known immunodeficiency. The most frequent symptoms were follicular scales (71%) and telangiectasia (63%). The mean Dd was higher in pityriasis folliculorum (m = 61 D/cm 2 ) than in PPR (m = 36 D/cm 2 ; P = .04); 42 patients with PPR had a high Dd, 6 had a low Dd.
  
  
  CONCLUSIONS
  Demodicoses are frequent and occur among patients who are immunocompetent. PPR with normal Dd are rare.
authors.affiliation: fabienne.forton@skynet.be <fabienne.forton@skynet.be>
authors.forename: Fabienne
authors.initials: F
authors.lastname: Forton
authors.forename: Marie-Anne
authors.initials: MA
authors.lastname: Germaux
authors.forename: Thierry
authors.initials: T
authors.lastname: Brasseur
authors.forename: Anne
authors.initials: A
authors.lastname: De Liever
authors.forename: Marianne
authors.initials: M
authors.lastname: Laporte
authors.forename: Chantal
authors.initials: C
authors.lastname: Mathys
authors.forename: Ursula
authors.initials: U
authors.lastname: Sass
authors.forename: Jean-Jacques
authors.initials: JJ
authors.lastname: Stene
authors.forename: Sylvie
authors.initials: S
authors.lastname: Thibaut
authors.forename: Muriel
authors.initials: M
authors.lastname: Tytgat
authors.forename: Bruno
authors.initials: B
authors.lastname: Seys
mesh_terms: D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008924:Mite Infestations / Q000175:diagnosis* / Q000453:epidemiology*; D012393:Rosacea / Q000453:epidemiology / Q000209:etiology