What Causes Swelling On Testicles?
Scrotal ultrasound will be needed.
Detailed Answer:
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A swollen tessticles without pain would either be hydrocoele or presence of water in the testis or an inguinal hernia. Did this happen over a long time or it just appeared in an instant. It is really very hard to diagnose testicular abnormalities without a proper physical examination and an ultrasound. I suggest doing a testicular ultrasound to have a good look inside your scrotum to properly diagnose your problem and advise the appropriate treatment.
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Regards, Manuel C. See IV, M.D. DPBU FPUA