title: Incidence of trichostasis spinulosa at a single institution in Yemen.
abstract: BACKGROUND
  Trichostasis spinulosa (TS) is a common, underdiagnosed cosmetic skin condition.
  
  
  OBJECTIVE
  The main objectives of this study were to determine the occurrence of TS relative to age and gender, to analyze its cutaneous distribution, and to investigate any possible familial basis for this condition, its impact on patients, and the types and efficacy of previous treatments.
  
  
  METHODS
  All patients presenting to the outpatient dermatology clinic at the study institution and their relatives were examined for the presence of TS and were questioned about family history and previous treatment. Photographs and biopsies of suspected cases of TS were obtained.
  
  
  RESULTS
  Of 2400 patients seen between August and December 2013, 286 patients were diagnosed with TS (135 males, 151 females; prevalence: 11.9%). Women presented more frequently than men with complaints of TS (6.3 vs. 4.2%), and more women had received prior treatment for TS (10.5 vs. 2.8%). The most commonly affected sites were the face (100%), interscapular area (10.5%), and arms (3.1%). Lesions involved the nasal alae in 96.2%, the nasal tip in 90.9%, the chin in 55.9%, and the cheeks in 52.4% of patients. Only 15.7% of patients had forehead lesions, and only 4.5% had perioral lesions. Among the 38 previously treated patients, 65.8% reported temporary improvement.
  
  
  CONCLUSIONS
  Trichostasis spinulosa is a common condition that predominantly affects the face in patients of all ages. Additional studies employing larger cohorts from multiple centers will be required to determine the prevalence of TS in the general population.
authors.affiliation: Department of Dermatology, Al-Kuwait University Hospital, Sana'a University, Sana'a, Yemen.
authors.forename: Mohammad A
authors.initials: MA
authors.lastname: Alshami
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001132:Arm; D001415:Back; D002648:Child; D005145:Face; D005148:Facial Dermatoses / Q000175:diagnosis* / Q000453:epidemiology* / Q000235:genetics / Q000628:therapy; D005260:Female; D006201:Hair Diseases / Q000175:diagnosis* / Q000453:epidemiology* / Q000235:genetics / Q000628:therapy; D006801:Humans; D015994:Incidence; D033162:Incidental Findings; D007642:Keratosis / Q000175:diagnosis* / Q000453:epidemiology* / Q000235:genetics / Q000628:therapy; D008297:Male; D008875:Middle Aged; D015995:Prevalence; D011537:Pruritus / Q000175:diagnosis* / Q000453:epidemiology* / Q000235:genetics / Q000628:therapy; D012737:Sex Factors; D015006:Yemen / Q000453:epidemiology; D055815:Young Adult