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Cupid's bow feature of a human lip. The upper and lower lips are referred to as the labium superius oris and labium inferius oris, respectively. [2] [3] The juncture where the lips meet the surrounding skin of the mouth area is the vermilion border, [4] and the typically reddish area within the borders is called the vermilion zone. [5]
To prevent AC from developing, protective measures could be undertaken such as avoiding mid-day sun, [2] or use of a broad-brimmed hat, [2] lip balm with anti UVA and UVB ingredients (e.g. para-aminobenzoic acid), [7] or sun blocking agents (e.g. zinc oxide, titanium oxide) [7] prior to sun exposure.
Chapped lips (also known as cheilitis simplex [5] or common cheilitis) [6] is characterized by the cracking, fissuring, and peeling of the skin of the lips, and is one of the most common types of cheilitis. [5] [7] While both lips may be affected, the lower lip is the most common site. [7]
The skin of the face is thicker than the skin overlying the lips where blood vessels are closer to the surface. As a consequence, the margin of the lips shows a transition between the thicker and thinner skin, represented by the vermilion border. It therefore has the appearance of a sharp line between the coloured edge of the lip and adjoining ...
The labia majora are lip-like structures consisting mostly of skin and adipose (fatty) tissue, which extend on either side of the vulva to form the pudendal cleft through the middle. They enclose and protect the other tissues of the vulva. The labia majora often have a plump appearance, and are thicker towards the anterior. [5]
On the front, each lip forks dividing into two portions surrounding the clitoris. The upper part of each lip passes above the clitoris to meet the upper part of the other lip—which will often be a little larger or smaller—forming a fold which overhangs the glans clitoridis (clitoral tip or head); this fold is named the clitoral hood.
Cleft lip and palate occurs in about 1 to 2 per 1000 births in the developed world. [2] Cleft lip is about twice as common in males as females, while cleft palate without cleft lip is more common in females. [2] In 2017, it resulted in about 3,800 deaths globally, down from 14,600 deaths in 1990.
The commissure is the corner of the mouth, where the vermillion border of the superior labium (upper lip) meets that of the inferior labium (lower lip). The commissure is important in facial appearance, particularly during some functions, including smiling. As such it is of interest to dental surgeons.