Intense skin dryness, discomfort, redness... rosacea is characterized by damage to the skin barrier leading to an increase in transepidermal water loss. However, during the winter season 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 flexibility.
However, in response to the effects of cold weather, proper hydration can promote the maintenance of the skin barrier's integrity by creating a protective film on the skin's surface. This film limits water loss and maintains an adequate level of skin hydration. Therefore, the use of certain occlusive agents (such as silicones, waxes, butters, etc.) and humectants (like hyaluronic acid, glycerin, etc.) should be prioritized. Emollient agents (ceramides, squalane, vegetable oils and butters, etc.) should also be favored, as they provide reinforcement to the skin barrier. These agents retain the skin's moisture while promoting its protection.
Furthermore, the use of active ingredients such as niacinamide can also aid in repairing the skin barrier. It helps to improve the structure of the epidermis by increasing the production of lipids, such as ceramides. Additionally, anti-inflammatory actives, like the azelaic acid, can reduce visible redness, stabilize blood vessels, and have a soothing effect. These active ingredients help restore the function of the skin barrier, thus leading to a decrease in irritation and redness.