Subvisible microscale texture is present on the crista cutis of the skin and interacts with incident light to create a soft and radiant 'shitsukan' appearance.
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Abstract
Objective: Previous studies have reported the existence of various topographic structures on the skin surface at different scales: visible and subvisible structures. Surface topography regulates the light reflection profile, and the relationship between light diffusion and human perception, such as soft appearance, has been well studied in the manufacturing industry. However, our understanding of how skin surface topography controls the optical properties of the skin surface and the appearance remains limited.
Methods: Two human studies were conducted involving healthy East Asian females. The topography of their skin was evaluated by measuring roughness parameters on skin replicas and roughness attributes on stripped corneocyte samples. These topographical attributes at different scales were compared with their perceived skin appearance, characterized by softness and radiance. Additionally, a novel image analysis algorithm to measure Crista cutis surface reflection (CSR) was developed to assess light reflection on their skin surface. The correlations of light reflection on the skin surface with these skin topographic parameters were also analysed.
Results: Through skin replica observations, attributes of subvisible microscale texture on the surface of the crista cutis were defined. This texture showed significant correlations with light diffusion on the skin surface measured as CSR, and this CSR strongly correlated with soft skin appearance and radiant skin appearance. However, neither macro-topography nor surface roughness on corneocytes showed a clear correlation with these skin attributes.
Conclusion: Subvisible microscale texture on the skin's surface is not visible to the naked eye. However, this structure plays a crucial role in regulating the optical properties of the skin's surface, which in turn leads to tangible differences in skin appearance.
期刊介绍：
The Journal publishes original refereed papers, review papers and correspondence in the fields of cosmetic research. It is read by practising cosmetic scientists and dermatologists, as well as specialists in more diverse disciplines that are developing new products which contact the skin, hair, nails or mucous membranes.
The aim of the Journal is to present current scientific research, both pure and applied, in: cosmetics, toiletries, perfumery and allied fields. Areas that are of particular interest include: studies in skin physiology and interactions with cosmetic ingredients, innovation in claim substantiation methods (in silico, in vitro, ex vivo, in vivo), human and in vitro safety testing of cosmetic ingredients and products, physical chemistry and technology of emulsion and dispersed systems, theory and application of surfactants, new developments in olfactive research, aerosol technology and selected aspects of analytical chemistry.
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