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Keywords:

  • allergic contact dermatitis;
  • methyl aminolevulinate;
  • Metvix®

This report describes 9 patients who developed allergic contact dermatitis to methyl aminolevulinate used for photodynamic therapy (PDT). The risk of developing contact allergy to methyl aminolevulinate in PDT treated patients was calculated to 1% after an average of 7 treatments (range 2–21).