Objective: Height of the vermilion of the medial part of the lower lip more than 2 SD below the mean
Subjective: apparently reduced height of the vermilion of the lower lip in the frontal view
Normal values for the height of the vermilion are available [Farkas, ] but measurements are not commonly used. Most clinicians determine this feature subjectively. The height of the vermilion of the lower lip varies considerably among ethnic groups, and the vermilion should be compared to a population of same ethnic background. If the lower lip vermilion is thin, the inferior border of the vermilion is less curved, and on a profile view, the lower lip vermilion is less convex than usual.