Huge pimple: Help

I've been having this HUGE pimple on my nose for almost 2 months already. It's about the size of a navel or a big mole. I'm afraid it'll become a mole in time to come or something. I've tried many things, in fact, it ruptured a couple weeks back and lots of pus and blood came out. I thought it was over, but right now it's back to pre-rupture size and I have no idea what to do.

Any suggestions? I'm willing to see a skin specialist or something, but my mom doesn't really agree.