The causes of the condition include common warts, localized cysts, and sebaceous adenomas. 1. common warts: HPV virus infection is caused by the local tissue protrusion, the surface may appear as a vegetable pattern, hard, rough and so on. 2. cysts: and local glandular obstruction caused by the accumulation of fluid, mainly by the local mucosal inflammation, can cause the scrotum on the growth of mung bean grain size of the hard pimples. 3. sebaceous adenoma: belong to the sebaceous gland tissue abnormal hyperplasia, part will be accompanied by local ulceration, pain, etc., can also cause the scrotum on the long green beans the size of the hard meat bumps. There may be other reasons for the appearance of meat bumps on the scrotum, you should consult a doctor in a timely manner to confirm the diagnosis of the condition, under the guidance of the clinician for standardized treatment.