It is called Philtrum. It is formed where the nasomedial and maxillary processes meet during embryonic development.
The philtrum runs from under the nose to the top of the lip. It may be more flat if a person has Fetal Alcohol Syndrome, and it also becomes more flattened with age. Philtrum cosmetic surgery may deepen one's philtrum.
Parafiltrum is the name of the skin between the nose and the upper lip.
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