Keratinization is a complex process, taking place in the cells of the epidermis and ending with the deposition of keratin (protein and fat in the stratum corneum, resulting in the corneal layer of the skin acquires strength and elasticity. Keratin is formed from amino acids, released in cell degeneration thorn layer of the epidermis, fat - mainly of keratohyalin granular layer (see the Skin). Violation of the process of keratinization observed in various dermatoses (see Daria disease, the Keratoses).