From more than 3-4 yrs i have a extra things in my scrotum in left side beside the left ball. I don't know what is it. When i press it, it goes to the upper in my body and vanished. After some times it comes. When i in bed or siiting position after pressing it it goes and not comes, when start walk or stand the scrotum hanging ,then this things comes.i am a 20 yrs old boy.
What is it? It have any problem?