bump under skin of penis on shaft

Hello, I was just wondering if I could get some input on this bump i have on the shaft of my penis. It's under the skin and its round, but it is located more down the shaft near the balls. I can feel it when I'm not erected as well as some sort of abrasion next to it as well. It only hurts when i meaningly discomfort it with my hands. I dont know how long it has been there and I'm kind of freaking out about this and was wondering if you had any idea what it is.