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The skin on the lips has a different structure from that of the face and body. It is very thin and does not have a stratum corneum, nor sebaceous glands, nor sweat glands. Lacking a hydrolipidic film, it is less well protected from dehydration and therefore very sensitive. It is then necessary to reinforce its hydrolipidic film with fatty substances. To preserve its natural barrier and hydration level, the use of a lip balm is therefore essential.
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