I have been suffering of testicular pain and testicular lump since March. I have done Ultrasound and it showed nothing and i have done blood test for infection and it also, showed nothing. the lump now i largare than what it was on march and it is a hard lump. Both physical examiner and the ultrasound doctor could not detect the lump even though i can feel it and touch it. what is this? could Ultrasound fail to detect lumps???