I've had a hard lump on my right testicle for a few months. It doesn't move, always in the same place and on occasions the testicle feels larger/swollen so not as noticeable. But when it's not swollen it's very prominent like a pen nib poking out is best way I can describe. Is that normal kind of lump or early sign of a cancer lump. I often check and it's definitely something new. I had some groin and lower back pain in the last six months too. 

 This past week also has been a concern as another two slightly smaller hard lumps above that one has appeared. 

i am waiting on appointment but I'm worried as doctor couldn't feel it but i could with some pressure due to swelling. Either way he put me forward for ultra scan. Just worried it's going to go a miss.