Intense skin dryness, discomfort, redness... rosacea is characterised by damage to the skin barrier leading to an increase in transepidermal water loss. However, during the winter period with the cold and dry air, the skin is even more dehydrated, and the blood vessels tend to contract in response to the cold, further enhancing the appearance of redness. The skin becomes more inflamed due to the proliferation of certain inflammation markers and thickens at the level of the horny layer, thus reducing its suppleness.
However, in response to the effects of cold, good hydration can promote the maintenance of the skin barrier's integrity by creating a protective film on the skin's surface. This limits water loss and maintains a sufficient level of skin hydration. Consequently, the use of certain occlusive agents (silicones, waxes, butters, etc.) and humectants (hyaluronic acid, glycerine, etc.) should be prioritised. Emollient agents (ceramides, squalane, vegetable oils and butters, etc.) should also be encouraged, as they will provide a reinforcement of the skin barrier. These agents will retain the skin's moisture while promoting its protection.
Furthermore, the use of active ingredients such as niacinamide can also help to repair the skin barrier. It can improve the structure of the epidermis by increasing the production of lipids, such as ceramides. In addition, anti-inflammatory actives, such as azelaic acid, can reduce visible redness, stabilise blood vessels, and have a soothing effect. These actives help to restore the function of the skin barrier, thus leading to a reduction in irritation and redness.