I'm 17 and have never had sexual intercourse. About two weeks ago, I discovered this sort of bump thing on the outer part of my vagina under some hair. It has grown a little since then, both grown up and wider.

It used to resemble a pimple, but not so much now. It's the color of a bruise and is a bump. When touched, I can feel it, but otherwise not. In the center, there is a tiny black dot as if someone put a pen mark there.

I'm really concerned, anyone know?

Do you shave, it could be an ingrown hair. Also pimples on the vaginas are normally deep and take a week or longer to work themselves out. I say keep an eye on it and if it persists and gets worse call your doctor.

Even if you don't shave, ingrown hairs are a huge possibility. If you can stand to do it, put a hot/wet compress on it to help take down the inflammation.
Other than that, heede what Hazel1220 said and see your doctor if it persists for too long.

I agree... it sounds like an ingrown hair... you can pick these kind of like picking a pimple and then you can squeeze out any pus that might be trapped in there... especially if it hurts at all, and then the hair usually is released and therefore the spot heals. Try this if you can handle it... otherwise keep an eye on it and talk to your doctor if it gets worse. Or if you have an open relationship try talking to your mom, a friend, teacher or friend's mom... or any other woman that you trust.

Yeah my hubby gets ingrown hair every wear even on his face for the longest time he thought they were pimples but I noticed a black line inside the pimple. It was an ingrown hair. Try to get the hair out with treazers and a sewing needle. Popping it can help but some times the hair is grown really deep down.