title: Occupational contact dermatitis from a grease.
abstract: BACKGROUND
  Contact allergy to grease is rare and often not even suspected. We investigated such a case in which the detected allergen was the stabilizer in the grease, which is rarely found as an allergen.
  
  
  OBJECTIVE
  Thin-layer chromatography (TLC) was used in a novel way and helped detect the allergen.
  
  
  METHODS
  Patch testing with our standard series, a metal-working series, the different substances individually, the grease in serial dilution and extracts of personal objects, the TLC plate. Gas chromatography-mass spectrometry was also used.
  
  
  RESULTS
  Test results indicated contact allergy to grease containing N-phenyl-1-naphthylamine and contact allergy to Disperse Orange 1, N-cyclohexyl-N'-phenyl-4-phenylenediamine, N-isopropyl-N'-phenyl-4-phenylenediamine, and N,N'-diphenyl-4-phenylenediamine.
  
  
  CONCLUSIONS
  N-phenyl-1-naphthylamine was the main cause of the patient's dermatitis. This case report underlines the importance of testing the patient's own products and also underlines the benefit of using TLC strips for patch testing and of visiting the workplace to get correct information about exposure conditions.
authors.affiliation: Department of Occupational and Environmental Dermatology, Malmö University Hospital, Malmö, Sweden.
authors.forename: Cecilia
authors.initials: C
authors.lastname: Svedman
authors.forename: Marléne
authors.initials: M
authors.lastname: Isaksson
authors.forename: Erik
authors.initials: E
authors.lastname: Zimerson
authors.forename: Magnus
authors.initials: M
authors.lastname: Bruze
mesh_terms: D015057:1-Naphthylamine / Q000009:adverse effects* / Q000031:analogs & derivatives*; D000485:Allergens / Q000009:adverse effects*; D009783:Dermatitis, Occupational / Q000175:diagnosis* / Q000209:etiology / Q000473:pathology; D003937:Diagnosis, Differential; D005148:Facial Dermatoses / Q000139:chemically induced / Q000175:diagnosis / Q000473:pathology; D006229:Hand Dermatoses / Q000139:chemically induced / Q000175:diagnosis / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010328:Patch Tests
chemical_list: D000485:Allergens; C005444:N-phenyl-1-naphthylamine; D015057:1-Naphthylamine