title: Photo developer allergic contact dermatitis in a photographer following paraphenylenediamine sensitization from a temporary henna tattoo.
abstract: BACKGROUND
  Paraphenylenediamine (PPD) is a coloring agent and potent sensitizer commonly added to henna tattoos to darken tattoo color. Photographic developers contain compounds that cross-react with PPD. Allergic contact dermatitis (ACD) from photo developers has been documented in the literature.
  
  
  OBJECTIVE
  We describe the rare case of a photographer who presented with a 4-year history of recurrent ACD following exposure to photochemicals. History taking revealed that 10 years before presentation, he had received a temporary henna tattoo.
  
  
  METHODS
  The patient was patch-tested with 4-methylaminophenol sulfate (Metol), the North American Contact Dermatitis Group (NACDG) series, and select other allergens.
  
  
  RESULTS
  Patch testing results revealed strong positive reactions to 4-methylaminophenol sulfate and PPD.
  
  
  CONCLUSIONS
  This is the first report to our knowledge of ACD from a photo developer occurring as a consequence of previous sensitization to PPD from a temporary henna tattoo. Due to the potential for long-term sequelae, an awareness of the risks associated with henna tattoos is warranted.
authors.affiliation: Division of Dermatology, University of Toronto, Toronto, ONDivision of Dermatology, University of Ottawa, Ottawa, ON tiffany.chen@medportal.ca.
authors.forename: Tiffany
authors.initials: T
authors.lastname: Chen
authors.affiliation: Division of Dermatology, University of Toronto, Toronto, ONDivision of Dermatology, University of Ottawa, Ottawa, ON.
authors.forename: Melanie D
authors.initials: MD
authors.lastname: Pratt
mesh_terms: D000328:Adult; D000627:Aminophenols / Q000009:adverse effects; D004396:Coloring Agents / Q000009:adverse effects*; D017449:Dermatitis, Allergic Contact / Q000175:diagnosis / Q000209:etiology* / Q000276:immunology / Q000473:pathology; D006801:Humans; D008297:Male; D009285:Naphthoquinones / Q000009:adverse effects*; D009784:Occupational Diseases / Q000139:chemically induced* / Q000175:diagnosis / Q000276:immunology / Q000473:pathology; D016273:Occupational Exposure / Q000009:adverse effects*; D010655:Phenylenediamines / Q000009:adverse effects*; D013653:Tattooing / Q000009:adverse effects*
chemical_list: D000627:Aminophenols; D004396:Coloring Agents; D009285:Naphthoquinones; D010655:Phenylenediamines; C014112:N-methyl-4-aminophenol; C005090:lawsone; C029728:4-phenylenediamine