Speculations
As Cawein continued to speak with the blue people and examine them, he was able to rule out any possible causes of the blue skin condition. He knew that it didn’t have anything to do with heart or lung disease, which are two huge things to rule out. He then was able to look more into any hereditary conditions that may be plaguing the family. He was then able to suspect that the blue skin condition was caused by a very rare blood disorder called methemoglobinemia. This is when the affected have an above-average amount of methemoglobin.