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Overview Porphyria cutanea tarda (PCT) is the most common porphyria. It is inherited as an autosomal dominant disorder in 20% of cases and is acquired in association with other disorders in the remaining 80% of cases. PCT is related to a deficiency of the enzyme uroporphyrinogen decarboxylase. First steps Stop exacerbating drugs (estrogens, OCPs, iron). […]