from the wiki:
"The human philtrum, bordered by ridges, is also known as the infranasal depression, but has no apparent function. That may be because most higher primates rely more on vision than on smell and so no longer need a wet nose pad or a philtrum to keep the nose pad wet."
" In Jewish mythology, Lailah, the Angel of Conception, lightly taps the infant's upper lip before birth, whereupon the infant forgets the Torah she has taught it. Some people speculate that this is the cause of the philtrum, but it does not have a basis in traditional Jewish texts."
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