Vermilion Border.

Definition

What it means.

The sharp line between the colored part of your lips (vermilion) and the surrounding skin. The vermilion border is one of the most distinctive features of the human face and is particularly sensitive to dryness and damage. Lip balm should be applied to cover the entire vermilion area including the border for complete protection.

Lip Barrier

The protective outermost layer of lip skin that prevents moisture loss and protects against environmental damage. Unlike regular skin, the lip barrier is much thinner and lacks oil glands, making it more vulnerable to drying and damage. Lip balm ingredients like beeswax supplement and strengthen this barrier, while oils like coconut and jojoba support its natural function.

Cheilitis

The medical term for inflammation of the lips. Cheilitis can be caused by allergic reactions (allergic contact cheilitis), environmental exposure (actinic cheilitis from sun damage), infections, nutritional deficiencies, or chronic lip licking. Symptoms include redness, swelling, cracking, and peeling. While Numbrrrz is not a treatment for medical cheilitis, maintaining lip moisture and barrier health can help prevent some forms.

Transepidermal Water Loss (TEWL)

The process by which water passes through the skin from the inside and evaporates from the surface. Lips have a very thin skin barrier and no oil glands, making them particularly susceptible to TEWL. Occlusives like beeswax reduce TEWL by creating a barrier, while emollients like coconut and jojoba oils help maintain the skin's own moisture retention capacity.