Fluhr, Joachim W; Moore, David J; Lane, Majella; Lachmann, Nadege; Rawlings, Anthony V; (2023) Epidermal Barrier Function in Dry, Flaky, and Sensitive Skin: A Narrative Review. Journal of the European Academy of Dermatology and Venereology 10.1111/jdv.19745. (In press).

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Abstract

The stratum corneum (SC)—the outermost layer of the epidermis—is the principal permeability and protective barrier of the skin. Different components of the SC, including corneocytes, natural moisturizing factor, a variety of enzymes and their inhibitors, antimicrobial peptides and lipids, work interactively to maintain barrier function. The main barrier properties of the SC are the limitation of water loss and the prevention of infection and contact with potentially harmful exogenous factors. Although the SC functions consistently as a protective barrier throughout the body, variations in functions and morphology occur across body sites with age and skin type. Healthy SC function also depends on the interplay between the chemosensory barrier, the skin's microbiome and the innate immune system. Dysregulation of SC barrier function can lead to the development of skin disorders, such as dry, flaky or sensitive skin, but the complete underlying pathophysiology of these are not fully understood. This review provides insight into the current literature and emerging themes related to epidermal barrier changes that occur in the context of dry, flaky and sensitive skin. Additional studies are needed to further elucidate the underlying aetiology of dry, flaky and sensitive skin and to provide tailored treatment.

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