Fluid accumulation around testis is called hydrocele and may occur following trauma, as well as following some inflammatory conditions. Irrespective of the etiology, the fluid will keep on accumulating and has to be guided out to get absorbed at some other place by an operative procedure to permanently cure it. While small hydrocele are common and may not require treatment, larger collections and those associated with physical disability or infertility may have to be treated surgically. While common procedure is called eversion of sac, there are many other surgical procedures. Your treating doctor would be able to explain the procedures as well as advantages and disadvantages of all alternatives.