Male patients with scrotal eczema, the scrotum will itch unbearably, especially at night when the scrotal itch is more serious and can affect sleep. Its night itching serious reasons are as follows: 1, night skin sensitivity, scrotal eczema patients sleep at night, the amount of activity to reduce the corresponding reduction in external interference, so their own sensitivity will increase, the perception of itching will also increase; 2, the body enters a state of sleep, the vagus nerve begins to enter a state of excitement, inhibiting the sympathetic nerve, when the scrotal eczema patients itching feeling will be significantly increased; 3 , patients unconsciously scratching while sleeping will also aggravate the itching, thus creating a vicious circle, the more scratching the more itching.