I have a hard painful lump on my mons pubis. The only thing I can think to compare it to is a cystic acne like pimple. It's been getting bigger and more painful over the last few days and right now its about the diameter of a marble. If I just look at it all I can see is a small welt-like mark but I can feel it's much larger under the surface. There is no redness at all. I know it's not an STD, I am in a monogamous relationship with the same person I lost my virginity to. Does anyone have an idea what this is?