Hello, 20 year old male here. I quite suddenly got a really painful red bump on my crotch area. It's within my pubic hair and it's quite hard and really, really painful to the touch. It became a problem really suddenly, as I just noticed it last night while laying in bed (I hadn't had anything down there earlier that evening). As I said it's really painful to the touch and it hurts even if my pants chafe on it.
I haven't had sex in a long time so I doubt it's an STD. What could this be? An ingrown hair? A zit (if it's even possible to get a zit down there)? Or something to be worried about?