Many people talk about sensitive skin and self-identify that they have sensitive skin, and products are designed for sensitive skin, but what is sensitive skin? Sensitive skin is a skin that reacts to cosmetic products.
The most important symptom is irritant dermatitis. Dermatitis means inflammation,that people see as mild redness and itching. The skin may feel stinging, burning, tender or raw.There may be scaling and peeling as signs of In the second stage of dermatitis.
Moisturizers and sunscreens are reported as triggers the most often.
Epidermal barrier impairment is one of the causes for sensitive skin. A healthy epidermis forms a barrier against the loss of water a serves as permeation of harmful chemicals and microorganisms to go in. Sensitive skin has impaired barrier function. Perhaps the barrier is a little leaky, not necessarily damaged. Filaggrin- protein plays an important role in the barrier function of the skin, and when it is deficient the function is impaired. Fillagrin plays a significant role in skin hydration too. So sensitivity and hydration have the same roots.
Many scientists see sensitive skin as multifactorial process. They insist that the most common and probably the most important factor for sensitive skin is barrier impairment. There also could be some degree of immune dysregulation, so a chemicals on the skin that normally should not cause a reaction create an irritant response. The other issue may beneural threshold that create different sensitivity.
The outermost layer of the skin has an acid mantle. It means that products should have a pH between 4.5 and 5.5, which is significantly more acidic than the rest of the body. It is necessary because the acid mantle plays a significant role in barrier function. If the acid mantle becomes more alkaline due to the use of harsh cleansers or creams, the barrier is damaged very quickly.
The acid mantle can be preserved by using products that are at least pH neutral or a little bit acidic. That is why using alkaline soaps is prohibited.
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