The part behind the ball sack, closer to the anus that feels like it's an extension of the penis hurts. It doesn't hurt now but if I put pressure on it it hurts. I've checked, i'm almost certain it's not my ball sack so it's not external injury, it's something on the inside of the ball sack, the "inner penis" back there that is in pain.
When I first noticed the pain I describe it as the feeling as if somebody had slit my ball sack, it felt like a cut or something.