Lactic acid, the ally of oily skin (+).

Oily skin is characterised by a shiny and glossy complexion, primarily in the T-zone area (forehead, nose and chin). This is a result of an overproduction of sebum by the sebaceous glands. As the activity of the sebaceous glands is under hormonal control, the primary cause of this hyperseborrhea is hormonal factors.

Please note : Sebaceous glands are auxiliary glands of the epidermis responsible for the secretion of sebum. They are present on the entire surface of the skin (at the dermis level) except on the palms of the hands and the soles of the feet (hairless areas).

Sebum is a complex mixture of lipids that form part of the hydrolipidic film. Its role is to protect the skin from external aggressions. Furthermore, it helps to maintain the hydration of the epidermis and prevent insensible water loss. Therefore, sebum is essential for the skin's good health.

However, when sebum is secreted in excess, it can lead to skin discomforts such as theappearance of acne. Indeed, the sebum can block the pores, which are the openings of the sebaceous glands on the skin surface. This fat-rich environment will be conducive to the proliferation of the bacteria responsible for the onset of acne, Cutibacterium acnes (formerly Propionibacterium acnes) which primarily feeds on sebum. This bacteria secretes pro-inflammatory substances that cause inflammation and the formation of spots.

In order to combat skin discomfort associated with hypersecretion of sebum, the use of cosmetics containing lactic acid can prove to be beneficial.

Oily skin is characterised by a dull complexion, enlarged pores, and potentially the emergence of blemishes (acne, blackheads).

The use of skincare products containinglactic acid can improve skin discomfort associated with excess sebum. Indeed, lactic acid is an A.H.A. known for its keratolytic properties. In other words, it accelerates skin renewal by eliminating dead cells on the skin's surface. This action helps to unclog blocked pores. The sebum can then distribute more evenly across the skin's surface. Thus,Cutibacterium acnes can proliferate less, which will reduce the appearance of spots. Moreover, the acceleration of cell renewal promotes a radiant complexion.

Thanks to its hygroscopic action, lactic acid also has moisturising and humectant properties. Contrary to what one might think, skin hydration is crucial even for oily skin. It helps to prevent transepidermal dehydration and restore the skin barrier, in order to protect the skin from external aggressions.

Thus, the use of a skincare product containing lactic acid is beneficial for oily skin as it gently exfoliates the skin, while respecting the skin barrier.