Itching at the base of the scrotum may be caused by allergies, scrotal eczema, scrotal fungal infections and so on. 1. Allergy: When certain allergic substances enter the human body, it will lead to an abnormal reaction of part of the body’s immune function, and the patient will have an itchy scrotum base with redness and swelling and other symptoms. 2. Scrotal eczema: when the patient is affected by infection, mental, endocrine, environmental, disease, local stimulation and immune function abnormalities and other factors, resulting in patients with itchy scrotum bottom, and sometimes spread to the anus around, and even extend to the penis. 3. Scrotal fungal infection: itchy scrotal base may be caused by scrotal fungal infection, which will lead to the patient’s scrotal skin rash, erythema, local flaking, itching, peeling and other symptoms. If there is an itchy scrotum bottom, it is recommended that patients go to the regular hospital in time, under the guidance of the doctor, relevant examinations, according to the patient’s specific examination results, active treatment.