I have been having a tingling sensation in my testicles. it comes and goes. i saw a urologist and had an ultrasound, no real answers from anyone?

Just watch for now..: Please watch and record the timing, duration, interval, and intensity of tingling and see if it is associated with lower backache or any physical activities. If the duration, interval, and intensity of tingling highly vary, it becomes less likely from infection or inflammation, but consider intermittent twist of testis or... For detail, a competent and trustworthy professional is needed for...