Porphyria
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Porphyrias are a group of inherited or acquired disorders of certain enzymes in the heme biosynthetic pathway (also called porphyrin pathway). They are broadly classified as hepatic porphyrias or erythropoietic porphyrias, based on the site of the overproduction and mainly accumulation of the porphyrins (or their chemical precursors). They manifest with either skin problems or with neurological complications (or occasionally both).
The term derives from the Greek πορφύρα, porphura, meaning "purple pigment". The name is likely to have been a reference to the purple discolouration of some body fluids in patients during an attack.
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