Thin upper lip vermilion UMLS:C1865017 HP:0200062 Decreased volume of upper lip vermilion HP:0200086 HP:0000219 Thin upper lips Thin vermilion border of upper lip Decreased volume of upper lip Normal values for the height of the vermilion are available [Farkas, 1981], but measurements are not commonly used. Most clinicians determine this feature subjectively or use the Likert scale for Caucasians and African Americans [Astley and Clarren, 2000]. The height of the vermilion of the upper lip varies among ethnic groups, and the vermilion should be compared to a population of same ethnic background. The thinness of the upper lip vermilion is sensitive to facial expression. On profile view, a thin vermilion is less convex than usual. A thin upper lip vermilion may be associated with a smooth philtrum and an absence of the Cupid's bow, but these should be assessed separately. Thin red part of the upper lip 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). Thin upper lip Decreased height of upper lip vermilion Thin vermilion border