Red bumps on the scrotum are usually caused by folliculitis, allergies, warts and so on. 1. Folliculitis: it may be caused by not doing a good job of local hygiene care. If men usually do not pay attention to hygiene, often let their private parts in a moist, poor ventilation environment, it is easy to make the hair follicle blockage, causing folliculitis, manifested as red bumps on the scrotum. Mild ones can subside on their own, while serious ones can be treated with topical biotin. 2. Allergy: If the scrotum skin comes into contact with allergens in normal life, it can also lead to the occurrence of this situation. It is recommended to take oral or topical medication such as chlorpheniramine maleate tablets and loratadine under the guidance of a doctor to carry out anti-sensitization treatment. 3. Acute warts: Scrotal warts is a sexually transmitted disease caused by human papilloma virus infection, the initial appearance of small light red pimples, suffering from acute warts, it is best to timely under the guidance of the doctor, the application of some anti-infectious effect of the ointment such as fusidic acid to control the condition. In addition, usually also regularly clean private parts, pay attention to hygiene care. For patients with red bumps on the scrotum and a long time can not be relieved, you should consult a doctor in a timely manner to clarify the cause of the disease for targeted treatment.