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Lips
The lips form the entryway of the mouth. The following structures underlie the epithelium of the skin of the lips:
 
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Vasculature
 
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Sweat glands
 
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Hair follicles
 
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Muscles that function to move the lips

The mucous membrane of the lips is non-keratinized with many capillary vessels close to the surface, giving it the pinkish/red color. Examination of the lips is valuable in recognizing signs of illness (eg, cyanosis, herpetic lesions) or trauma.

Cyanosis: A bluish or purplish discoloration (as of skin) due to deficient oxygenation of the blood.
 
 
The lips, or labia, serve as the entryway to the mouth.
 
Examination of the lips is valuable in recognizing signs of illness or trauma.
 
There are 2 different surfaces of the lip—the skin and the mucous membrane.
 
The vasculature, sweat glands, and hair follicles underlie the keratinized epithelium of the lips.
 
The mucous membranes of the lips are
non-keratinized.
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