Red itchy Bump on vagina?

So there's this reoccuring bump by my vagina it's like right above it. it hurts when I touch it and it's itchy. I'm still a virgin and I am 17. And it's happened to me before and it's gone away but it hurts. I haven't shaved so I know that's not why it appeared. So what is it cancer? A disease? Something natural? Should I have it checked?