>>1316150 (prev)

>>1316125 (prev)

Actually it was this rare genetically transmitted disease that started the Vampire myth.

Anemia causing pale skin

Gums that receded causing the the teeth to appear more prominent and one type of this genetic condition is extremely sensitive to sunlight, causing red purplish rashes and blistering.

They also sometimes have an aversion/dislike of garlic.

Yes, people with porphyria do have a genetically different metabolism, but has nothing to do with that fact that ingesting blood is highly nauseating and will cause vomiting.