Apparently some people ar just naturally blue https://en.wikipedia.org/wiki/Blue_FugatesHeck, even some people are blue (but that is because of cyanosis, which is usually followed alveoli discharge, or "lung purge" as some call it, but that's for another discussion)
The Fugates, a family that lived in the hills of Kentucky, commonly known as the "Blue Fugates"[1] or the Blue People of Kentucky, are notable for having been carriers of a genetic trait that led to the disease methemoglobinemia, which gives sufferers blue-tinged skin.