large lump on the base of the right testicle which comes and goes. over the last year i've had three ultrasounds and each time i went to get the scans the lump wasn't present. the ultrasounds did not detect anything apart from a minor varicocele. previous to the last 2 months the lump would appear randomly even when i wasn't engaged in any sexual activity yet every time i went to see my gp it wouldn't show itself. . recently i've noticed the large lump usually appears when i'm doing something sexual. thanks
you could have a spermatocele. and accumulation of sperm in the epididymis. these may "come and go". less-common would be epididymitis but this should be painful. next time the lump appears make sure to have it examined while it is still there.