HP_0000343 (Long philtrum) is distance between nasal base and midline upper lip vermilion border more than 2 SD above the mean. Alternatively, an apparently increased distance between nasal base and midline upper lip vermilion border. Also known as: Elongated philtrum, Increased height of philtrum, Increased length of philtrum, Increased vertical dimension of philtrum, Vertical hyperplasia of philtrum.