What's porphyria cutanea tarda?

See below: Pct is one of the hepatic porphyrias. Large amounts of porphyrins build up in the liver when the disease is becoming active. The disease becomes active when acquired factors, such as iron, alcohol, hepatitis c virus (hcv), hiv, Estrogens (used, for example, in oral contraceptives and prostate cancer treatment) and possibly smoking, combine to cause a deficiency of urod in the liver.