Lips are lower or upper fleshy structure surrounding the opening of the mouth. It serves as an opening for the intake of food and also helps with the articulation of our voice. Lips have sensory nerve which could become sensitive when kissing another person in a sexual manner. The skin of the lips and its fewer melanocytes (responsible for the production of skin color pigments) is what gives our lips a thinner and contrasting color compare to the facial skin surrounding it. Therefore the blood vessels appear on the lips which gives it's red color. It is also worth mentioning that lips do not have sweat gland or sebaceous glands, therefore it gets drier faster that other areas of human body.
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