Research on the seasonal change of lip surface condition.

概要

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Lip has a characteristic skin compared with other part of skin. The studies on lip skin are quite a few. To investigate the seasonal change of lip condition, same evaluation methods were applied, such as analyzing photographs of lips, measuring moisture content with impedance meter, measuring color with color and color difference meter and taking surface temperature.These evaluation methods were applied to 35 women (the average age is 32.8 years old ranging from twenties to fifties), and executed six times in a year; september, November, January, April and June. As the results, the followings are proven: lip becomes chapped not only in the winter time but in around June, and its moisture content certainly decreases in the winter time. The younger women's lips get chapped more easily. The group of a high moisture content and low transepidermal water loss (TWL) is significantly less chappy. The group of a lower surface temperature than average is significantly chappy.
日本化粧品技術者会の論文