INTRODUCTION
SKIN DISEASES, COLD
As per the Korean Statistical Information Service, the country has the longest working hours among OECD countries, with a total of 1928 h as of 2021. Many office workers in Korea complain about feeling dry air during winter. Hot air blown out by heating devices used in offices can strip the skin of moisture; moreover, providing proper ventilation may be difficult in cold weather. This can result in exposure to indoor dust and dry environments. If this environmental exposure persists, it can lead to skin stress and may accelerate the aging process.Changes in temperature also affect the skin. Many studies have reported the relationship between temperature changes and skin hydration as well as TEWL. Temperature and TEWL showed a positive correlation.People commonly experience skin problems and discomfort during winter, especially when exposed to dry indoor environments. However, only few studies in Korea have investigated the effects of winter conditions in an office environment on normal skin without skin diseases. Therefore, in this study, changes in skin characteristics were investigated by controlling the exposure environment for 6 h. In addition, improvements in the area where a ceramide‐containing cream was applied were investigated.