Small meatballs next to the scrotum are mainly caused by diseases, and common causes include genital herpes, sebaceous cysts, and fibromatosis. 1. Genital herpes: genital herpes is a sexually transmitted disease caused by the herpes simplex virus. The herpes virus enters the human body through mucous membranes and broken skin, and the infection can lead to meatballs, blisters, and ulcers in the genital area, often accompanied by pain and itching. 2. Sebaceous cysts: Sebaceous cysts are benign diseases in which sebum accumulates and forms cysts. Localized sebaceous gland secretion in the scrotum may lead to compression and blockage of the sebaceous glands as well as hair follicles, thus showing a round swelling in the scrotum. 3. Fibromatosis: Fibroma is a tumor caused by overgrowth of cells in fibrous tissues. Benign tumors can occur in the scrotum, usually with clear boundaries and slow growth. Patients often show symptoms of small meatballs in the scrotum. The above symptoms may also be caused by other factors, when the patient has obvious discomfort, should immediately go to the regular hospital for consultation and treatment.