Scabs on the outer skin of the scrotum and penis may be caused by scrotitis, scrotal eczema or allergies. 1. Scrotal inflammation: after the scrotum area is infected by bacteria, scrotal inflammation can be induced, so that the patient appears itching symptoms, some patients may scratch the area, resulting in broken skin, leading to the scrotum and penis outer skin with scabs. 2. Scrotal eczema: prolonged sedentary time can lead to the existence of scrotal eczema disease, the disease will also lead to the scrotum and the penile epidermis symptoms of itching, scratching the site can also cause the production of scabs. 3. Allergy: When the patient’s scrotum and penile tunica come into contact with irritating substances, it can cause allergy, leading to the appearance of the wind and itchy symptoms, which can also lead to scabs in the area. Scalp and penile epidermis with scabs may also be caused by other reasons, such as trauma, sebaceous gland infection, etc., should go to the hospital in time to clarify the cause of the disease, and follow the doctor’s instructions to choose the appropriate method of treatment.