Itchy red bumps on the scrotum may be caused by scrotal dermatitis, may also be caused by scrotal eczema, scrotal herpes, and may be related to mosquito bites.1, scrotal dermatitis: if long-term unhealthy sex life, or do not pay attention to the pubic hygiene, or often wear some of the tighter underwear, may make the scrotum inflammatory reaction. When the inflammation stimulates the scrotum, it will make the patient appear the symptoms of red bumps, itching, redness and swelling of the scrotum, and some patients may also have the symptoms of scrotal pain. It is recommended that patients usually try to pay attention to pubic hygiene, and use ointment to smear the scrotum to alleviate the symptoms under the doctor’s advice; 2, scrotal eczema: if the patient’s body moisture is heavy, or stimulation, contact with allergens, the scrotum may appear eczema, the patient may have scrotal red bumps, itching and other symptoms. Usually patients can use tacrolimus ointment to apply to the scrotum under the doctor’s advice, so as to achieve the purpose of treating the disease and alleviate the symptoms of itching and red bumps on the scrotum; 3, scrotal herpes: also known as genital herpes, caused by the herpes simplex virus infection, the affected area may have a burning sensation, as well as red pimples accompanied by itchiness, and the red pimples are formed more quickly to form small blisters, and the blisters break down and then form ulcers. Usually you can use acyclovir tablets to inhibit the replication of the virus, thus playing a certain antiviral role; 4, mosquito bites: if the patient’s scrotum by mosquito bites, there will also be red bumps of the symptoms of the red, swollen, itchy, usually can be in the mosquito bites coated with some soapy water or eau de cologne to alleviate the symptoms.