HP_0000233 (Thin vermilion border) is height of the vermilion of the medial part of the lip more than 2 SD below the mean, or apparently reduced height of the vermilion of the lip in the frontal view. The vermilion is the red part of the lips (and confusingly, the vermilion itself is also often referred to as being equivalent the lips). Also known as: Decreased volume of lip, Decreased volume of lip vermillion, Thin lips, Thin vermillion.