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I understand your concern.
Hydroceles(fluid-filled sac in the scrotum) is caused by bulid up too much of the fluid or it does not drain well,inflammation or injury of the testicle or epididymis.
Small hydroceles often go away on their own within six months.
It requires surgical treatment only if it gets large enough to cause discomfort or disfigurement.
Hope this helps.
Let me know if you have further query we can discuss it.
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Waiting for your response.