vermilion zone

ver·mil·ion zone

, vermilion transitional zone
the red margin of the upper and lower lip that commences at the exterior edge of the intraoral labial mucosa ("moist line") and extends outward, terminating at the extraoral labial cutaneous junction; a thinly keratinized type of stratified squamous epithelium deeply penetrated by well-vascularized dermal papillae which show through the translucent epidermis to impart the typical red appearance of the lips. Compare: vermilion border.

ver·mil·ion zone

, vermilion transitional zone (vĕr-milyŏn zōn, tran-zishŭn-ăl)
The red margin of the upper and lower lip that commences at the exterior edge of the intraoral labial mucosa ("moist line") and extends outward, terminating at the extraoral labial cutaneous junction; a thinly keratinized type of stratified squamous epithelium deeply penetrated by well-vascularized dermal papillae which show through the translucent epidermis to impart the typical red appearance of the lips.
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References in periodicals archive ?
Extraorally, there are two components, one is erosion, which was seen on lower lip, extending from 1 mm away from left angle of mouth up to midline and superoinferiorly from vermilion zone to 2 mm above the lower lip line, with irregular borders, measuring about 1 cm x 2 cm, roughly oval in shape, surface was smooth.
Caption: Figure 1: Clinical picture showing erosion on lower lip extending from 1 mm away from left angle of mouth up to midline and superoinferiorly from vermilion zone to 2 mm above the lower lip line