A specie of blue people have been found is Kentucky. According to research the disorder is called  Methemoglobinemia (or methaemoglobinaemia) is a disorder characterized by the presence of a higher than normal level of methemoglobin (metHb) in the blood. Methemoglobin is an oxidized form of hemoglobin that has a decreased affinity for oxygen, resulting in an increased affinity of oxygen to other heme sites and overall reduced ability to release oxygen to tissues.

The blue People appear as below;

Paul Karason

Rosemary Jacobs her skin Turned Blue when she was 11 years old