Hello BP and welcome to HCM.
Thank you for your query.
If your blood and urine reports are normal, with absolutely no indications of an infection, then we should directly look into the region of discomfort. We cannot comment on the reasons without proper investigation.
First of all, a physical examination and palpation of the affected testicle and comparison with the normal one, will have to be performed. After this a more conclusive investigation would be an ultrasound
(sonogram) of the testicle.
A more detailed description of your symptoms will also be necessary. Any pain? Swelling? Difficulty in urinating? Decreased flow of urine? Or any other urinary symptoms experienced will have to be discussed with your doctor.
I hope I have succeeded in providing the information you were looking for. Please feel free to write back to me for any further clarifications. I would gladly help you.