The review summarizes information about the main causes and pathogenesis of xerosis cutis as one of the conditions indicating a violation of the epidermal barrier. Xerosis cutis is a clinical sign of a decrease in the amount and/or quality of lipids and/or hydrophilic substances in the stratum corneum of the epidermis. The modern approach to the treatment of dermatoses accompanied by violations of the epidermal barrier includes basic moisturizers. Urea not only moisturizes the skin. It is involved in the regulation of barrier function and antimicrobial protection. It is a low-molecular regulator of protein synthesis in keratinocytes, such as filaggrin, loricrin, involucrin and transglutaminase 1, cathelicidin, beta-defensin-2, water and urea carrier proteins into the cell, as well as proteins that promote the synthesis of intercellular matrix lipids. The main dermatotropic pharmacological effects of urea (hydration of the epidermis, strengthening of the barrier function of the skin, keratolytic effect, increased penetration of drugs into the skin) have been used in dermatological practice for many years. External agents with urea are used to treat skin diseases accompanied by dryness and excessive keratinization, to correct the deformation of nail plates of various genesis, to facilitate the local penetration of medicines. The use of topical UrocrEM5, UrocrEM10, Uroderm ointments containing 5%, 10% and 30% urea, respectively, is effective and safe.
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