As the outermost layer of the body, the skin has many functions to maintain constant conditions in response to variable external factors. Despite these functions, the skin may be altered by various environmental factors such as temperature and humidity. In particular, skin barrier recovery is reduced when relative humidity is high. 1 According to Tsukahara et al, 2 in dry environments, skin elasticity is decreased and wrinkles form easily. Several studies have reported that sudden changes in humidity can cause abnormalities in the skin