[Allergic contact eczema caused by dicyanodiamide]

After four years employment in a factory manufacturing flame retardants, a 29 year old man developed eczematous reactions on both hands. Patch tests performed with different agents handled by the patient solely at his place of work were positive for the flame retardant and dicyanodiamide, even in high dilutions. Upon changing jobs, the lesions healed completely. To our knowledge, this is the first recorded instance of a contact allergy due to dicyanodiamide in the pertinent literature.