So for the past month or so I've had this one white hard lump on my penis. Located in the middle of the shaft of my penis. It's hard when I play with it like on the inside. Rubbery in feel. It dosent pop. I had 2 others many moths ago(that poped) but they disappeared this one is still there. No bigger than a pea. I'm sexually active (orally and touch). My girlfriend has been checked and has nothing so maybe I was born with something. Any thoughts?