My left testicle was removed 3 weeks ago.
Left untreated TC will kill you - taking out your heart and brain with secondary tumors - but it is very curable.
My left testicle swelled up ever so slightly. I hesitated a couple of weeks before seeing an eminent urologist who initially, on a physical examination, found nothing ... then did an ultrasound which showed a tumor growing right in the middle of the testicle. There was no lump

Don't even think of hanging around - take your troubles to a doctor who has an ultrasound machine.
And I am going through all this in a language and country totally foreign to me.