Cyanoacrylates are widely used in adhesive techniques. Cyanoacrylate adhesives differ physically for the different needs of application, and chemically in function of the size of ester molecules. A 40-year-old man employed at the National Mint and Stamp factory presented with hyperkeratotic lesions on the fingers of the right hand. His job consisted of fixing microchips to plastic phone cards with Loctite Series 414. Patch testing confirmed sensitivity to cyanoacrylates. After the diagnosis of allergic contact dermatitis was established, the patient, to be cured of the dermatitis, changed his workplace 2 months later.