I'll bet that's what this guy that was a teacher at a neighboring school had! This hemoglobin "disorder"! I knew my parents said it was some kind of heart or blood disorder! He was more "teal" than outright blue, though. If I could just see a photo of the blue people, I'd know for sure.
I just checked google images and the only photos are pretty indistinct. The color photography of the day was pretty primitive