Abnormal lip morphology Thin vermilion border UMLS:C0578038 HP:0000233 Thin vermilion borders HP:0000213 Decreased volume of lip vermillion 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). The vermilion is the red part of the lips, and the vermilion border is the rim of paler skin that demarcates the vermilion from the rest of the skin of the face. Thin lips Thin vermillion Decreased volume of lip SNOMEDCT_US:301348000