Hi Thern0477
2 years ago I have a similar problem. I had a little lump aside mi left testicle, causing pain when walking a lot, even sometimes being seated was very annoying. I visited my Physician and he sent me with an Urologist, He made an ultrasound and different tests in my urine, at the end he discovered it was an enlarged vein (Varicocele), as it was in an early stage surgery was not needed, with some pills and being in bed for some days was enough.
Follow sage009 advice and visit an Expert.
This is something you need to have checked by a urologist. That does'nt mean that it is something serious, only that it could be. You need to have an ultrasound of your testicles to find out what it is that your feeling, the test is real simple nothing to worry about. If you have any more questions please go to www.tccancer.com go to the forums, there are alot of great people there that will help.
Wish you all the best.