title: Skin picking disorder is associated with other body-focused repetitive behaviors: findings from an internet study.
abstract: BACKGROUND
  There is a lack of consensus on how to conceptualize skin picking disorder (SPD). It has been proposed that SPD is related to other problematic body-focused repetitive behaviors (BFRBs), such as hair pulling disorder (HPD) and problematic nail biting and cheek biting.
  
  
  METHODS
  We compared rates of BFRBs in online samples of SPD sufferers and college students. We also examined family history of HPD and skin picking problems and correlates of BFRB comorbidity in the SPD sample.
  
  
  RESULTS
  Prevalence of BFRBs was significantly higher in the SPD sample compared with the college student sample. One-half (50.8%) of the SPD sample had a first-degree relative with problematic skin picking, and 7.9% had a first-degree relative with diagnosed HPD. Finally, correlates of BFRB comorbidity indicated that when multiple habits co-occur in an individual, they tend to involve the same body area.
  
  
  CONCLUSIONS
  These findings are the first to show that SPD and BFRBs other than HPD frequently co-occur. Furthermore, they extend previous work showing that SPD has a family component and suggest that SPD and HPD may run in the same families. Given the recruitment method and the self-report nature of the comorbidity data, replication in clinical samples is needed.
authors.affiliation: Department of Psychology, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, USA. ivarsnorrason@gmail.com
authors.forename: Ivar
authors.initials: I
authors.lastname: Snorrason
authors.forename: Emily J
authors.initials: EJ
authors.lastname: Ricketts
authors.forename: Christopher A
authors.initials: CA
authors.lastname: Flessner
authors.forename: Martin E
authors.initials: ME
authors.lastname: Franklin
authors.forename: Dan J
authors.initials: DJ
authors.lastname: Stein
authors.forename: Douglas W
authors.initials: DW
authors.lastname: Woods
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015897:Comorbidity; D007174:Disruptive, Impulse Control, and Conduct Disorders / Q000145:classification / Q000453:epidemiology*; D005260:Female; D006801:Humans; D020407:Internet; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D012652:Self Mutilation / Q000453:epidemiology; D012867:Skin / Q000293:injuries*; D014256:Trichotillomania / Q000453:epidemiology*; D055815:Young Adult