I've been to the doctor about an ache ive been having in my bladder area and groin, he think it's an infection an has given me Erythromycin. He also checked my testicles and said they were fine. Although I can feel a small hard lump which I can move linked to my epydimis above my right testicle, I'm not sure whether this is just part of the epydimis or not! I do trust the doctor, but it's hard to feel when my scrotum is tight, What should I do??