Evaluation of changes for sebum, skin pore, texture, and redness before and after sleep in oily and nonoily skin

BACKGROUND: People whose skin type is oily have experienced an esthetic and hygienic discomfort due to the excessive secretion of the sebum during the day and night time, and therefore sebum control is required. In this study, we aimed to find out whether the skin status between the oily and nonoily skin indicates a significant difference before and after sleep. MATERIALS AND METHODS: Forty Korean males and females whose skin type was oily or nonoily participated in this study. To investigate the difference of the skin between oily and nonoily skin before and after sleep, we measured the sebum, skin pore, texture, and redness on their cheek at baseline and after 4‐h sleep. Moreover, the significant level was determined at p < 0.05. RESULTS: Parameters of sebum and skin pore significantly increased after 4‐h sleep compared with baseline in the oily and nonoily skin (p < 0.05). Moreover, the increment of sebum and pore parameters in the oily skin was significantly higher than those in the nonoily skin (p < 0.05). In the case of skin texture and redness, parameters of them were significantly changed after 4‐h sleep compared with baseline only in the oily skin (p < 0.05), and there was no significant difference among groups. CONCLUSIONS: We found that the change rates of the sebum secretion and skin pore in oily skin were significantly higher than those in nonoily skin after 4‐h sleep. These results suggest the necessity of the skin care depending on the skin type before sleeping.