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Best Answer: The vertical groove between your upper lip and nose is known as the 'philtrum'. It allows for a greater range of lip motions than would otherwise be possible. http://en.wikipedia.org/wiki/Philtrum.
When mucus and air cannot flow easily between the nose and sinuses, abnormal pressures occur in the sinuses, and mucus can build up in them. This creates a pressure-pain in the forehead or face, between and behind the eyes, or in the cheeks and upper teeth, depending on which sinuses are involved.