Scrotal swelling is the swelling of scrotum (the sack/bag that holds your balls). Reasons can be many from a harmless cyst to cancerous tumor. If you have persistent pain and see any kind of swelling, don’t delay; see a good sex specialist immediately. After a physical examination, your doctor may ask for imaging or biopsy to determine/confirm the actual cause and treat accordingly. Treatment of scrotal swelling may be as simple as a prescription or may even require a surgery.