Itching in the scrotum can be due to many conditions like allergic reaction, tight undergarments
, eczema, skin friction, bacterial infection, fungal infections, pubic lice and scabies. What are the other symptoms you have been having? Moisture, irritation, and bacterial overgrowth can result in fungal growth in the groins which can also spread to the scrotum and cause itching. Wear cotton undergarments. Maintain good hygiene.