So, you believe this is hydrocele? Have you been diagnosed by your doctor? Typically, once past infancy, it occurs due to inflammation or injury. Did you have a precipitating injury that you recall? You've been fully evaluated? You need to rule out tumor or hernia. It does go away on its own for many. How long has it been? Can you take an Nsaid or anti inflammatory to help? (like ibuprofen)? Do you have pain or is just visually bothering you? Surgery is the usual route when it won't go away. It is not usually considered major surgery or anything but understand that it is invasive at a sensitive area. https://www.mayoclinic.org/diseases-conditions/hydrocele/diagnosis-treatment/drc-20363971
If you haven't had a physical in recent years, get one soon, and ask the attending physician some questions about your testicles. I presume you've been reading about hydroceles and have decided that's what you have. And that may not be true.