I think I've just found it

it's a Varicoceles I've examined my scrotum and found just like the venous plexus at the surface and I can see it clearly and can sense it with my finger at the bottom and behind (not on the side) the left side testis and when i checked the right testis its smooth and there is no veins appears like on the other side ... how could I didnt notice it or feel there is something wrong all that time ago ????
When I stand and bend over ahead and when the scrotum laying down I see that the left side testis is laying down more than the other one (they are not on a straight horizontal line ) and I cant only notice the venous plexus when the testis lays down