Red bumps on the scrotum can be considered folliculitis, scrotal eczema and scabies nodules, etc. It is recommended to go to the hospital in time for further examination to clarify the cause of the disease. 1. As the skin folds in the scrotum are prone to dirt accumulation, and sweat glands and hair follicles are widely distributed, so if you don’t pay attention to personal hygiene, it may cause folliculitis, resulting in the appearance of red bumps. 2. If there are immune abnormalities, living in a humid environment for a long time as well as scratching may cause the occurrence of scrotal eczema, which will also be manifested as red bumps on the scrotum. 3. In addition, it may be caused by direct contact or indirect contact with the human scabies mite through clothing, resulting in the appearance of scabies mite nodules.