And this explains, that those supernatural, blood drinking ‘vampires’ from the werewolf – vampire folklores of the 20th century, were perhaps humans suffering from a rare genetic disorder – Porphyria.
Porphyria comes from the word ‘Porphura’ meaning Purple pigment. So, how this disease is related to the purple pigment and more so, why is it known as the Vampire disease?
Porphyria is related to Porphyrins – a chemical produced by Healthy Human body, that is somewhat purple in color. And the absence of this, leads to the dreaded vampire disease. 