I have this problem too :( Its gross. Its not all my zits. I notice it when I pop the white heads on my chin, around my nose. I also get this type of smell when I feel a lump behind my ear. I'll squeeze it gently and all this white crap comes out. its not even like a zit, but it smells like rotten cheese like you say.
What the hell does this mean? I never even thought to ask about it.