Thin upper lip vermilion (HP_0000219) is height of the vermilion of the upper lip in the midline more than 2 SD below the mean. Alternatively, an apparently reduced height of the vermilion of the upper lip in the frontal view (subjective). Also known as: Decreased height of upper lip vermilion, Decreased volume of upper lip, Decreased volume of upper lip vermilion, Thin upper lip, Thin vermilion border of upper lip.