<s>[INST] hi; I;ve just had a surgery to remove the prostate 3 weeks ago. The last 4 days I've had an elarged left testicle to 3 times the size of the normal with pain of enlarged testicle. It decrease in size to almost normal after 6-8 hours lay down. I am fit and 50 years old. Thanks [/INST] HelloThanks for query.It is common to get swelling of the Testicle after prostate surgery as the bacteria liberated after resection or removal of prostate transmitted from surgical site through Vas Difference to the testicle causing infection of testicle (Orchitis).It gets cured within 2 weeks with antibiotics and anti inflammatory drugs like Diclofenac twice daily .Dr.Patil. </s>