I'm only 18 but yes my left testicle has little things around it.
Mine's actually on the top and like a mini one on the bottom, but they've been there a while and i've had to be felt by the doctor due to other issues down there.
I don't think you have anything to be worried about if so visit the local GP.
But like i said i have something to the north of my left testicle which has no pain but feels like a small little box thing, i can't describe how it feels!
but i don't think it's a problem i think it's normal.
sorry i can't be much help.