you are feeling your epididymis which is normal to be on top of both testicles.
they can be tender if you feel and press on them too much.
they are normal and not a sign of cancer.
you would not have cancer on both of your testicles.
get a testicular or scrotal ultrasound. I bet it will show normal epididymis and testicles on both sides.
let me know if you have other questions.
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