Itchy scrotum is more itchy in hot water may be due to eczema, allergies, fungal infections and other reasons. 1. Eczema: If there are problems such as lack of breathability in underwear and not changing clothes in time, there may be localized sweating in the scrotum, which may lead to localized eczema. Usually the symptoms are redness, swelling and itching, and washing the scrotum with hot water may aggravate the itching sensation. 2. Allergy: If you are allergic to allergens, inadvertent contact with allergens may lead to localized itching, erythema, and so on, while in contact with hot water will aggravate the itching. 3. Fungal infection: If you have low resistance and do not change your underwear often, it may lead to the growth of fungus, which may lead to the above symptoms. The above symptoms may also be caused by other factors, it is recommended that patients go to the regular hospital in time for treatment, eat a light diet, and improve lifestyle habits, pay attention to personal hygiene, and strive for early recovery.