He doesn't eat, once called it a 'vile human habit'. So it can be assumed he doesn't have a circulatory system or his circulatory system is simply not working which would normally feed his body nutrients.
With this, he can also survive in space unassisted (numerous episodes) - which suggests he doesn't breathe or process oxygen.
Blood needs oxygen replenishment to turn from blue to red. As well as a functional circulatory system that replenishes the nutrients which further discolors the blood to blue. Neither of which he has.
So his lips. Without 'red blood' circulating, are blue.
He's immortal. I suspect that's just another way of saying he's undead.
A pretty fantastic attention to detail on the writer's parts, don't you think?
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