<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have a mass in my scrotum and I am feeling lower abdominal pain. What could be the possible cause?  <response>: The symptoms youre describing point towards Epididymitis, which is an inflammation of the epididymis, a tube located at the back of the testicles. It commonly presents with swelling, pain, and tenderness in the affected area. 