|This article needs additional citations for verification. (December 2006) (Learn how and when to remove this template message)|
Erythema above the lips, making it more difficult to distinguish the vermilion border.
|Latin||pars intermedia labiorum oris|
The vermilion border (sometimes spelled vermillion border) is the normally sharp demarcation between the lip and the adjacent normal skin. It is thus the edge (border) of the red (vermilion) of the lip. It represents the change in the epidermis from highly keratinized external skin to less keratinized internal skin. It has no sebaceous glands, sweat glands, or facial hair.
There are two reasons for the border being red:
- The epithelium is thin.
- This epithelium contains eleidin which is transparent and the blood vessels are near the surface of the papillary layer, revealing the "red blood cell" color. At the angles of the mouth, there are sebaceous glands, without hair follicles, which are called Fordyce's spots.
A vermilionectomy (sometimes spelled vermillionectomy) is the surgical removal of the vermilion border. It is sometimes performed to treat carcinoma of the lip.