Red, itchy scrotum, may be scrotal eczema, contact dermatitis, ringworm and other diseases caused. 1. Scrotal eczema: internal and external stimulation of a variety of factors causing local skin and mucous membrane inflammatory reaction, may cause scrotal skin redness, swelling, itching, accompanied by a pronounced tendency to exudate in the acute phase, chronic inflammation may also cause skin dryness and mossy dandruff and other symptoms, so it may lead to the scrotum red, itchy. 2. contact dermatitis: don’t take the skin contact to the sensitizer will cause local inflammatory reaction, may cause skin erythema, rash, pimples, blisters and other symptoms, may also lead to scrotum red, itchy. 3. Ringworm: mainly caused by dermatophyte infection of the groin, perineum, buttocks and other skin ringworm disease, may also lead to scrotum red, itchy symptoms. To summarize, if the scrotum red, itchy, there may be other reasons, it is recommended to go to the hospital in a timely manner to check, clear the cause of treatment as prescribed by the doctor.