Under the tongue is sublingual (most common), subglossal, or hypoglossal.he philtrum runs from under the nose to the top of the li … p. 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.