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The term pseudoporphyria describes a cutaneous condition that mimics porphyria cutanea tarda (PCT) in adults and erythropoietic protoporphyria in children. Pseudoporphyria is frequently linked to the ingestion of drugs, primarily nonsteroidal anti-inflammatory drugs (NSAIDs). The course is prolonged in some patients, but most reports describe symptoms that disappear several weeks to several months after the offending agent is withdrawn. These authors retrospectively studied patients with pseudoporphyria who were treated at the Mayo Clinic between 1992 and 1996. Normal porphyrin levels were required for a diagnosis of pseudoporphyria and inclusion in this study; of 261 patients with PCT-like symptoms, the researchers found 20 with pseudoporp…