The lips are fundamental in contributing to the harmony of our face and helping define our identity, but what is their real structure? From an anatomical point of view, the lips are composed of the upper and lower vermilion, which are in turn made up of different layers of tissue: cutaneous, muscular, and mucous.
The lips define the mouth opening and are characterized by a darker reddish coloring than the skin covering the rest of the body. This particular coloration is due to the reduced thickness of the skin on the lips and the proximity of blood vessels.
The skin of the lips is made up of stratum corneum, epidermis, and dermis. However, the stratum corneum here is made up of only 3-6 layers of cells, far less than the 15-16 layers found on the skin of the face. The lips have much thinner skin than the rest of the face and are defined by their smooth, shiny surface, which results from the absence of hair follicles and the presence of a thick inner mucosal layer.