Greasy nose and black heads?! HELP?

I have VERY good skin from my moms side. My face is practically porcelain and I don't have a pimple in site, and when I eat junk food, I have never had a break out. I have a pretty nose from my dad's side, not to flat, not to pointy, not to bony,not to long, it's just right :) but *RRRRRRRR* I have a tone of black heads on my nose and my nose for some reason is greasy! Why is that? And how can I stop it? No other part of my face is greasy ever! When ever I touch my nose, and rub my fingers together, I feel nasty grease, and I have black heads on my nose and only on my nose, It's really gross and I want to get rid of it. help?