title: Lichen planus in childhood: report of 100 cases.
abstract: BACKGROUND
  Lichen planus (LP) is uncommon in children, and there have been few large studies on LP in this patient group. Most of the literature on childhood LP has appeared as case reports or isolated case series.
  
  
  METHODS
  We report the results of a study on 100 children with LP, which is, to our knowledge, the largest study to date on this condition.
  
  
  RESULTS
  The mean age of patients was 8.76 years and mean age at disease onset was 7.6 years. The onset of the disease was most commonly seen on the legs (54% of patients). The classic papular lesions were the commonest morphology seen (42% of patients). The oral mucosa was involved in 17% and nail involvement in 19% of children.
  
  
  CONCLUSIONS
  Vaccination against hepatitis B has been suggested to be causally related to the onset of LP in various published studies. However, only 16 of our patients had been vaccinated against hepatitis B. If there is a causal relationship, more cases of LP in children may occur in the future, as vaccination against hepatitis B becomes routine in India.
authors.affiliation: Department of Dermatology, Venereology and Leprology, Postgraduate Institute of Medical Education and Research, Chandigarh, India. ajkanwar1948@gmail.com
authors.forename: A J
authors.initials: AJ
authors.lastname: Kanwar
authors.forename: D
authors.initials: D
authors.lastname: De
mesh_terms: D000293:Adolescent; D017677:Age Distribution; D000367:Age Factors; D017668:Age of Onset; D002648:Child; D002675:Child, Preschool; D005260:Female; D017325:Hepatitis B Vaccines / Q000009:adverse effects*; D006801:Humans; D007194:India / Q000453:epidemiology; D008010:Lichen Planus / Q000453:epidemiology / Q000473:pathology*; D008297:Male; D012720:Severity of Illness Index; D012737:Sex Factors; D013997:Time Factors
chemical_list: D017325:Hepatitis B Vaccines