By André O. Barel, Marc Paye, Howard I. Maibach
Within the context of accelerating complexity and class in elements and tighter legislation and legislation, scientists from educational dermatology and dermato-cosmetics departments, the cosmetics undefined, manufacturers of components and uncooked fabrics, and regulatory companies evaluation the numerous faces of the beauty box. They conceal aim organs for beauty items, protection issues, autos of beauty items, elements, items, laws and rules around the globe, trying out items, and beauty claims. between particular subject matters are the traditional nail, hypersensitive reaction and hypoallergenic items, liposomes, anti-irritants for sensory inflammation, pores and skin detoxification bars, laws in Japan, and assessments for dermis hydration.
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Additional info for Handbook of Cosmetic Science and Technology
Skin Res Technol 1995; 1:68–73. 111. Qu D, Masotti CJ, Seehra PG. Effect of age and gender on the viscoelastic properties of skin. J Cosmet Sc 2006; 28(2):197–198. 112. Corcuff P, Leveque JL. Skin surface replica image analysis of furrow and wrinkles. In: Serup J, Jemec GBE, eds. Handbook of Non Invasive Methods and the Skin, Boca Raton: CRC Press, 1995; 89–95. 113. Hoppe U, Sauermann G. Quantitative analysis of the skin’s surface by means of digital signal processing. J Cosmet Chem 1985; 36:105–123.
1). In the young group, the highest vascular responses to HN were the perioral area and the neck. In the older group, the chin, cheek, and nasolabial area showed the highest skin reactivity to HN. This difference between the two age groups might be partly explained by the enlargement of the sebaceous glands in the elderly (10), which could be induced by the long-term exposure to the sun. The UVA has been reported to induce sebaceous gland hyperplasia (11), which might lead to the enlargement of the sebaceous glands in the face when compared to other areas (12,13) and in the elderly when compared to the younger subjects (10,14).
As we will consider in this chapter, age has a direct impact on the evolution of most of the biophysical parameters of the skin. Skin Relief Many publications have shown the incidence of aging on the increase in its roughness, the evolution of the microdepressionary network of the skin (110), and the development of wrinkles whatever the ethnic group considered (57). To simplify, roughness can be considered as submitted to external and internal influences such as the climatic environment, the sun exposure, and the effect of cosmetic products but also the water content of the skin’s superficial layers (112–115).