In obama’s case, it is an outward sign of drug use. He supposedly doesn’t have any of the diseases associated with the bluish discoloration, but we know he was a heavy drug user.
I know nothing about his drug history; however, now that he is President he must have a few sleepless nights. I know that doesn’t do any good for my eyes. I don’t know if fatigue affects colored skin differently, I will have to look more closely at those around me. I know that when a colored person is very ill, they can look greyish.