title: 'New' contact allergens.
abstract: OBJECTIVE
  Due to the continuously changing environmental conditions, it is necessary to regularly monitor and update the spectrum of contact allergens that elicit contact dermatitis. New contact allergens and known contact allergens with currently increasing importance need to be identified for diagnostic and preventive purposes.
  
  
  RESULTS
  Within the last few years, allergic contact allergy to a number of substances derived from plants and other materials was reported for the first time. Furthermore, it has become obvious that dyes, especially paraphenylenediamine-related dyes, and fragrances are sources of contact allergens with increasing frequency. It is likely that within these groups of substances some as yet unidentified agents are relevant allergens.
  
  
  CONCLUSIONS
  It is an ongoing challenge for clinicians to meticulously explore the exposure of eczema patients to possible new allergens. Dyes and fragrances, in particular, are of increasing significance not only because of their known ingredients but also because of new allergenic compounds.
authors.affiliation: Department of Dermatology, University Clinics of Schleswig-Holstein, Campus Kiel, Kiel, Germany. jbrasch@dermatology.uni-kiel.de
authors.forename: Jochen
authors.initials: J
authors.lastname: Brasch
mesh_terms: D000485:Allergens / Q000276:immunology*; D004396:Coloring Agents / Q000009:adverse effects; D003358:Cosmetics / Q000009:adverse effects; D003836:Deodorants / Q000009:adverse effects; D017449:Dermatitis, Allergic Contact / Q000276:immunology*; D017453:Dermatitis, Irritant / Q000276:immunology*; D006229:Hand Dermatoses / Q000276:immunology*; D006801:Humans; D010476:Perfume / Q000009:adverse effects; D010655:Phenylenediamines / Q000009:adverse effects
chemical_list: D000485:Allergens; D004396:Coloring Agents; D003358:Cosmetics; D003836:Deodorants; D010476:Perfume; D010655:Phenylenediamines; C029728:4-phenylenediamine