Scrotum swelling. 5 years from 2019!

Sir my father age is 55 years he have testicular or scrotum swelling from 2019 itself it's 5-6 years since he have this swelling no pain present only discomfort like pant become tight little discomfort from driving bike like this but all this present from 3-4 years not new problem but no ultrasound not shown to any doctor till now as my father told me ki it is hydrocele may be he knows about hydrocele and thinks he also have hydrocele but today I read in Google ki testicular swelling or scrotum swelling may be due to testicular cancer I am afraid I just call my physician on phone he told me ki no don't worry if swelling is present from 5 years with this much little discomfort only it can't be cancer cancer can't be present for 5 years without treatment as such but I am afraid can it be a testicular cancer sir please tell so I can proceed further no pain but little discomfort like pant tight discomfort while driving bike and this swelling present from last 5 years from 2019