title: Primary hyperhidrosis increases the risk of cutaneous infection: a case-control study of 387 patients.
abstract: BACKGROUND
  Although primary hyperhidrosis (PHH) has been frequently associated with diminished quality of life, the medical consequences of the condition are less well studied.
  
  
  OBJECTIVE
  The objective was to study the clinical presentation of PHH and to determine its relationship to cutaneous infection.
  
  
  METHODS
  A retrospective case-control study of patients encountered between 1993 and 2005 with the International Classification of Diseases, Ninth Revision diagnosis code for hyperhidrosis (HH) and meeting criteria for PHH was conducted.
  
  
  RESULTS
  Of 387 patients with PHH included, 59% were female and 41% were male; mean age was 27.3 years (range 2-72). Sites of HH included soles (50.1%), palms (45.2%), and axillae (43.4%). Distributional patterns of HH were isolated axillary (27.6%), palmoplantar (24.3%), isolated plantar (15%), axillary/palmoplantar (5.7%), isolated palmar (5.7%), and craniofacial (5.2%). Axillary HH was more common in female patients (P = .004). The mean age of onset (18.6 +/- 12.3 years) indicated a mean duration of untreated symptoms of 8.9 years. Age at onset for palmoplantar HH (11.5 +/- 8 years) was significantly younger than for axillary HH (20.0 +/- 8.3 years; P < .0001), whereas onset of craniofacial HH (25.4 +/- 13.7 years) was older (P < .001). Exacerbating factors included stress/emotion/anxiety (56.7%) and heat/humidity (22%). The overall risk of any cutaneous infection was significantly (P < .0001) increased in HH compared with controls (odds ratio [OR] 3.2; 95% confidence interval [CI] 2.2-4.6). Site-specific risks of fungal infection (OR 5.0; 95% CI 2.6-9.8; P < .0001), bacterial infection (OR 2.6; 95% CI 1.2-5.7; P = .017), and viral infection (OR 1.9; 95% CI 1.2-3.0; P = .011) were all increased. Risks of pitted keratolysis (OR 15.4; 95% CI 2.0-117; P = .0003), dermatophytosis (OR 9.8; 95% CI 3.4-27.8; P < .0001), and verruca plantaris/vulgaris (OR 2.1; 95% CI 1.3-3.6; P = .0077) were particularly increased. Association with atopic/eczematous dermatitis (OR 2.9; 95% CI 1.5-55; P = .019) was observed.
  
  
  CONCLUSIONS
  Retrospective design and single-institution study are limitations.
  
  
  CONCLUSIONS
  Patients with HH are at high risk of secondary infection. Management of HH may have a secondary benefit of decreasing this risk.
authors.affiliation: Department of Dermatology, University of Iowa, Iowa City, Iowa, USA. hobartwalling@yahoo.com
authors.forename: Hobart W
authors.initials: HW
authors.lastname: Walling
mesh_terms: D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D016001:Confidence Intervals; D003881:Dermatomycoses / Q000453:epidemiology / Q000209:etiology / Q000503:physiopathology; D005260:Female; D006801:Humans; D006945:Hyperhidrosis / Q000150:complications* / Q000175:diagnosis*; D015994:Incidence; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D011336:Probability; D011379:Prognosis; D012189:Retrospective Studies; D012307:Risk Factors; D012720:Severity of Illness Index; D017678:Sex Distribution; D017192:Skin Diseases, Bacterial / Q000453:epidemiology / Q000209:etiology / Q000503:physiopathology; D012874:Skin Diseases, Infectious / Q000453:epidemiology* / Q000209:etiology* / Q000503:physiopathology; D017193:Skin Diseases, Viral / Q000453:epidemiology / Q000209:etiology / Q000503:physiopathology; D055815:Young Adult