Pus-filled lump inside outer labia majora.

[ceireboleyn]

So I have this pus-filled lump just inside the outer labia (labia majora, I think) and it's reasonably hard on the inside. It doesn't hurt in general, only when I squeeze it. When I do squeeze it, yellow liquid-y pus will come out followed by a little clear fluid, but it never gets any smaller, nor does it drain or empty completely - no matter how hard I squeeze it I can't pop it, drain it or get to the core of it. It just sort of refills. I've had spots like this before, much smaller though, and once I pop them they go away - but not this one. At first I thought it was an ingrown hair or a pimple but I'm really worried it's a cyst and that it might be malignant? I'm scared to go to the doctor for fear of what it might be - obviously I will, I'm due for a smear soon so I'll have to, but in the meantime, does anyone have any theories about what it might be and/or how to get rid of it once and for all?

[ceireboleyn]

Thanks for the help...