So a few months ago i was experiencing some discomfort in my left testicle, went to a GP to get it checked out and he said that everything was fine and that it's most likely an infection. A few months later and i feel a hard area on the back of my left testicle which is smaller than a pea and only hurts a little when i touch it, but when i'm not there's no discomfort at all. My anxiety is making me worry a lot about this and I've booked another GP appointment but while I'm waiting I just wanted to ask for some information on what this could be.

Thank you