bump on vag

I literally just got up to go to the bathroom and seen this huge bump on you outer most part of my vag like basically on my leg but still in the pubic hair area kinda. I squeezed it and pus came out. It hurts so bad I have no other bumps on the inside of my vag it burning when I pee but I've had lots of watery discharge that leave my underwear soaked. Is this an STD?