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12 of The Rarest and Weirdest Diseases Know to Mankind

By Karly Carpena
October 24, 2016


1Lion Face Syndrome: Leontiasis Ossea, or Lion Face Syndrome, is rare disease that is marked by the overgrowth of bone tissue in the face and jaw. This condition often affects the mouth, nose and sinuses, and many folks who suffer from this condition are completely blind due to the bone tissue literally crushing their optic nerves.