[qazibasit (OP)]

what cause the lips red and why do the lips get black in smokers.

[Exodus]

I would have thought that lips get red when they, ahem, fill with blood...

[qpan]

Lipstick.

"I have great faith in fools; self-confidence my friends call it."
-Edgar Allan Poe

[gsmollin]

I think lips are a mucus membrane, and are therefore red from blood flowing in capillaries just below the surface.

[qazibasit (OP)]

i have heard something like melanin keeps it red

[Exodus]

Is it not just down to the number of capillaries under the skin?

[ChaoticLogic]

The characteristic red color of the lips is unique to humans and comes from the blood vessels in the dermis. The many rete pegs (papillae) are long and narrow, and contain loops full of blood vessels. The closeness of these vessels to the surface, combined with a thin, almost transparent epidermis, gives rise to the red appearance of the lips.

[matrixer]

lips r red coz pure oxygenated blood flows through here and they get red colour!another possibility is maybe our sliva* glands keep them red maybe!!!
and its proved that smoke can turn the colour of bright diamond into coal!lolz aint it