The reasons for sleeping with a moist scrotum include prostate disease and varicocele. 1. Prostate disease: prostate disease can lead to scrotal humidity, commonly found in chronic prostatitis. For example, chronic prostatitis can also be combined with frequent urination, urinary urgency, lower abdominal discomfort, and perineal soreness. With the cure of chronic prostatitis, the symptoms of scrotal humidity disappear. 2. Varicose veins: The scrotum also has many blood vessels, and varicose veins can occur when blood flow is impaired. Varicose veins can lead to slow blood flow and metabolism in the scrotum, resulting in a feeling of swelling and sweating in the scrotum. You should change and wash your underwear every day, and they need to be exposed to the sun. Because the testicles and the inner thighs are in close contact, if you do not pay attention to personal hygiene, it is easy to lead to bacterial or fungal growth, localized dampness, itching symptoms. Patients with localized dampness and itching of the scrotum need to go to the hospital in time.