Porokeratoses are disorders of epidermal keratinization, the aetiology
of which remains to be elucidated. We present the uncommon case of a
70-year-old man with genitoanocrural porokeratotic lesions successfull
y treated by CO2 laser vaporization. The patient's occupational histor
y and the late onset, site and multiplicity of the lesions suggest the
ir induction by benzene, a known carcinogen.