Urologist said my hydrocele can go away by itself. How is that possible? Also, sometimes it is bigger at times. Dsnt hurt. Dr didn't recmd surgery

Hydroceles. A Hydroceles is a collection of fluid surrounding the testicle and is the most common cause of scrotal enlargement. Caused by trauma or infection/inflammation, as the primary process resolves the swelling may go down. Hydroceles can vary in size over time. Surgery is indicated only when they are painful or bothersome.