There are many reasons for small bumps on the scrotum, such as scabies nodules, folliculitis, viral warts, molluscum contagiosum and so on. 1. Scabies nodules: Scabies mite infection, biting local skin, can lead to itching, some because of scratching secondary infection, thus causing mossy changes, scabies nodules in the scrotum area, resulting in small bumps on the scrotum. 2. Folliculitis: secondary bacterial infection of the scrotal skin follicles can also lead to the symptoms of small bumps on the scrotum. 3. Viral warts: human papilloma virus infection caused by warts, common warts, etc., can also lead to small bumps on the scrotum. 4. Molluscum contagiosum: a benign tumor that may also cause small bumps on the scrotum. There may be other reasons why there are small bumps on the scrotum, so you need to go to the hospital in time to check and follow the doctor’s instructions.