The lips are outlined from the surrounding skin by a transition area called the:

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The vermilion zone of each lip has a darker appearance than the surrounding skin,with the lips outlined from the surrounding skin by a transition zone,the mucocutaneous junction.On the midline of the upper lip extending downward from the nasal septum is a vertical groove,the philtrum.The line of demarcation between the firmer and pinker attached gingiva and the movable and redder alveolar mucosa is the scallop-shaped mucogingival junction.The midline of the mandible is marked by the mandibular symphysis.

The Lips Are Outlined from the Surrounding Skin by a Transition