Painless bump

I've noticed a bump in my pubic area (not close to my labia or vagina), and it's been there for the last six months, which was the last time I was sexually active. We used a condom, but I know that doesn't excuse my reckless behavior. The bump isn't filled with pus, just slightly red and isn't painful. It's small, about half the size of a pea. Do you think it could be an STD or nothing to worry about at all?