The sensitive skin is a skin condition : it can affect all skin types. However, dry skin is more prone to hypersensitivity. Producing less sebum than normal to oily skin, they are less protected against external aggressions. The barrier provided by their hydrolipidic film is also less effective. In some cases, sensitive skin can be painful and peel.
The main symptoms of sensitive skin are as follows: tingling, tightness, sensations of heat, redness, irritations, as well as acne outbreaks or inflammations. Various elements can cause skin sensitivity. This can be of genetic origin or caused by an intolerance to certain external or internal factors such as pollution, the sun, stress, hard water, certain products, or hormonal disorders. A change in environment can also alter the state of your skin. It then sends several signals to express its discomfort.
From a biochemical perspective, according to recent studies, the level of corneocytes is reduced in individuals with sensitive skin, leading to enhanced transcutaneous penetration of water-soluble chemicals. Corneocytes are constituents of the stratum corneum, located on the surface of the epidermis, and play a protective barrier role. The expression of certain transglutaminases, proteins that also contribute to the skin's barrier function, is also lower in sensitive skin. It is also observed that the synthesis of filaggrin, an epithelial protein playing a key role in the skin barrier, is less significant in individuals with sensitive skin. Lastly, it appears that these individuals secrete an excess of certain pro-inflammatory cytokines, partly responsible for the observed irritations and redness.