Porphyria cutanea tarda and estrogens

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Abstract
Porphyria cutanea tarda can be induced by a variety of compounds, including estrogens. Cutaneous manifestations of the disease are characterized chiefly by a light-and trauma-sensitive eruption of exposed areas. In 2 cases occurring secondary to estrogens, improvement followed estrogen withdrawal. Estrogens are known to be capable of impairing hepatic excretory function, but their precise role in inducing porphyria is not understood. It is possible that in predisposed individuals they inhibit enzymes necessary for the normal metabolism of porphyrins.