Yep. Don’t worry about it bud. I can’t believe I’m announcing this in the open but I have the same thing. Not so small though. Has the diameter of a penny, maybe a dime. Found it my junior year of HS and BUGGED out. Immediately told my dad about it, who then told my mother, which in itself was hard enough to tell them about it especially being still young. Went and got an ultrasound, funny story actually cuz I got a chubby when the women rubbed the gel on my balls and started swirling the Ultrasound thing around on my nuts.
Anyway, it turned out to be a cyst. Essentially its a benign lump filled with dead sperm and water. No threat unless it gets bigger in which case it just gets uncomfortable and they said they could remove it. Otherwise, they said there is no point for surgery and just leave it be. I still have it now, 4 years later and can feel it when I’m scrubbing the ol’ sack in a hot shower. Told my girlfriend about it and she said she can’t even feel it when she tried to. So as long as it aint freaking the girls out I’m cool with keeping it.
If you can, what my doctor showed me was this. He squeezed the bump and put a flashlight up to it in the dark. It’s fully transparent which means it’s just a cyst full of liquid.