Porphyria Cutanea Tarda By Herbert L Bonkovsky, MD, Wake Forest University School of Medicine; Sean R Rudnick, MD, Wake Forest University School of Medicine Reviewed / Revised Dec 2022 View Patient Education Pathophysiology Symptoms and Signs Diagnosis Treatment Prevention Key Points More Information Topic Resources Porphyria Cutanea Tarda... Porphyria Cutanea Tarda... Porphyria Cutanea Tarda Porphyria Cutanea Tarda With... Porphyria cutanea tarda (PCT) is a comparatively common hepatic porphyria affecting mainly the skin.