I just had an operation to remove such a csyt from my scrotum as you are describing, but in my case, my csyt was the size of a golf ball. The technical term is spermatocele. It is a sperm filled sac attached to one of the tubes that leave the testicle. They are benign and will not cause you any harm and most uros just recommend leaving them alone unless they bother you.
I had mine for 15 years before I decided to have it removed, and the only reason I got rid of it was that it was getting too big and crowding out my testicles. Like I said , it was the size of a golf ball.
The surgery was a piece of cake, in and out in 30 min. I felt absolutely zero pain or discomfort after the surgery. Some men have a lot of pain from this type of surgery, and so I was expecting a lot more then what I had. My surgeon was even surprised when I told her that I had no pain or discomfort, NOTHING.
The size you are describing, I would recommend just leaving it alone. It might not grow any bigger, but if it does , then you can have it out at a later time. Like I said it is benign and does not cause any harm.
Age 56, Biopsy 6/2007 - PSA 4.5, 2 of 12 with <5% cancer Gleason 6
Surgery 9/2007 Strong Memorial, Rochester NY with Dr. Jean Joseph (1300 plus surgeries)
Path - Negative margins, cancer in 20% examined tissue, Gleason 6
Post Op - No ED issues, full erections without drugs, used 5-7 pads a day for 3 months. Now dry except for stress leaks now and then.
All post op psa's <.04