After the bath, especially in the fall and winter and other seasons, may cause the body itchy symptoms intensified, currently considered for four reasons: First, the bath time is too long, the bath time is too long it is easy to make the skin’s stratum corneum is damaged, so that the skin’s outer protective film is damaged, the stratum corneum’s ability to lock water decreases, so that the skin is dry and prone to itching. Secondly, the water temperature of the bath is too high, after the hot water stimulates the skin, it tends to stimulate the subcutaneous nerve to produce itching. Third, too many baths, too frequent, but also easy to the skin surface sebum membrane to wash away, the skin stratum corneum to protect the skin’s ability to weaken, so that the skin is easy to dry. Fourth, excessive rinsing and rubbing when bathing can wipe off the skin’s protective layer, also leading to itchy skin after bathing.