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Porphyria cutanea tarda associated with disinfectant misuse.

Porphyria cutanea tarda was detected in a 44-year-old janitress. The illness was probably caused by the unintentional synthesis of a polychlorinated phenol as a result of mixing commonly available household ingredients in toilet bowls and shower stalls. Although the evidence for this hypothesis is circumstantial, its likelihood and the wide-spread household use of these reagents justify calling attention to the innovative misuse of disinfectants as a potential source of toxic exposure.