Hi, I've had these tiny white lumps in my vagina for a couple of years (months?), but I never thought anything of it because they were so small (kinda like little mosquito-bites, only it's white-tish)... until yesterday.
Yesterday, when I was showering, I found out that the lump had increased in size (overnight?

)- it's now like the size of a small marble. If you put pressure on it, it kinda hurts, and it doesn't move when I try to move the 'marble' around. The 'center' of the 'marble' has a purple/blackish-spot on it (kinda like the color of a scar that you get after being bruised... only it has no elevation; it sorta just blends into the skin.) This is only on the left side of the vagina; the right side seems normal, and is smooth, with some small, minor bumps (like goosebumps).
This is really bothering me; I couldn't sleep all night worrying about it. Can someone please tell me what this is? I know I should probably see a doctor for this, but I dont know how to bring up the topic to my parents.

And I also want to wait a while to see if it goes away.
Oh, and I'm a virgin - never had a partner, and in the teens.
If you have any input, please post them! Thanks ahead of time.