title: Allergic contact dermatitis to temporary tattoos with positive para-phenylenediamine reactions: report of four cases.
abstract: BACKGROUND
  In recent years, temporary tattoos instead of permanent tattoos have become popular worldwide. Although contact allergy to temporary henna tattoos appears to be rare in the past, it is progressively more commonly reported.
  
  
  METHODS
  Four Taiwanese patients of allergic contact dermatitis following application of temporary tattoos were patch tested and they were followed up for 1 year after treatment.
  
  
  RESULTS
  All four of the tested patients were positive to paraphenylenediamine. At 1-year follow-up, all four patients still showed various degrees of remnant hyperpigmentation on their previous tattooed areas.
  
  
  CONCLUSIONS
  Temporary tattoos may pose similar risks of allergic reactions associated with permanent tattoos. A high risk of prolonged post-inflammatory hyperpigmentation after allergic contact dermatitis from temporary tattoos should also be alerted, especially in Asian skin type.
authors.affiliation: Department of Dermatology, Chang Gung Memorial Hospital, Taipei, Taiwan.
authors.forename: W H
authors.initials: WH
authors.lastname: Chung
authors.forename: C M
authors.initials: CM
authors.lastname: Wang
authors.forename: H S
authors.initials: HS
authors.lastname: Hong
mesh_terms: D000328:Adult; D004396:Coloring Agents / Q000009:adverse effects*; D017449:Dermatitis, Allergic Contact / Q000209:etiology* / Q000276:immunology; D005260:Female; D006801:Humans; D008297:Male; D010655:Phenylenediamines / Q000009:adverse effects* / Q000276:immunology; D013653:Tattooing / Q000009:adverse effects*
chemical_list: D004396:Coloring Agents; D010655:Phenylenediamines; C029728:4-phenylenediamine