There are many causes that can lead to a testicular lump, including a cyst, hydrocele, varicocele, infection or cancer.
Imaging the lump should be considered to narrow the differential. An ultrasound would be a reasonable first step.
I would also obtain urine tests to rule out infection, and obtain a prostatic massage or transrectal ultrasound to evaluate for prostate infection.
These options can be discussed with your personal physician, or in conjunction with a urologist.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
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