What is the presence of sebaceous glands in the red areas of the lips?

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Contains 30% sebaceous glandsHouses 75% sebaceous glandsHas very few or almost no sebaceous glandsCompletely lacks sebaceous glands

Explanation

The red zones of the lips have either a very limited number of sebaceous glands or none at all, distinguishing them from other skin regions that contain a higher density of these glands.