Itchy red spots on the scrotum can be caused by eczema, allergic factors, ringworm, scabies and so on. 1. Eczema: Inflammatory skin reactions caused by internal and external stimulation of various factors may lead to scrotal eczema, causing the symptom of itchy scrotum with red spots. 2. Allergic factors: contact dermatitis, insect bite dermatitis, drug rash and other allergic causes, may also lead to scrotum with red spots itchy. 3. Ringworm: fungal infection caused by perineal skin inguinal skin ringworm disease, can also cause scrotum red spot itch, some also cause ring-shaped erythema, flaking and other symptoms. 4. Scabies: Scabies mite infection, biting the scrotum skin can also cause the scrotum with red spot itch. Scrotum with red spots itch, there may be other reasons, need to go to the hospital in time to check, follow the doctor’s instructions for treatment.