Vermilion border
The vermilion border—the visible red portion of your lips—represents uniquely vulnerable tissue. Its stratum corneum is only 3-5 cell layers thick compared to 15-20 on facial skin. It lacks sebaceous glands entirely. It contains minimal melanin, offering virtually no UV protection.
This structural vulnerability explains why lips dry out, chap, and sun-damage so easily. The vermilion cannot protect itself the way facial skin does; it depends entirely on external care and protection.
Our lip care content emphasises understanding this vulnerability. Effective lip protection requires addressing what the vermilion border cannot provide itself—moisture delivery, lipid nutrition, protective sealing, and sun protection.
Also Known As
- Lip vermilion
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