I discovered a lumpy mass on my testicle the other day. (It has appeared in the last month.) It is about 1/3 the size of my right testicle, on the bottom of the testicle.
It doesn't hurt, but is tender if I try and squeeze it. It is attached to the testicle inside the scrotum - not separate or outside.
I have had a vasectomy. Is this something I need to worry about? What could it be?