@copperpipe -- You can use a comedone extractor on closed comedones, but it can be a little tricky the first time.
What you have to do with a closed comedone is to steam your face, like you would if you were going to extract a blackhead.
Then take a sterile lancet and gently open the skin above the closed comedone. Some of the professional comedone extractors come with lancets on one end, but if you use one like that, then make sure it's sterile.
Then you gently push on the comedone with the loop of your comedone extractor, like you would for removing a regular blackhead.
If it still doesn't come out, you can try to open it a little more with the lancet, but don't push it too far -- you don't want to cause a scar.