My old carrara vanity top had that. I found that it was from soaps, and it looked oily to me to (mostly underneath the soap dispenser). Unfortunately, I never really got rid of it until I pitched the vanity top. But it was old and already there when I moved it. If it had been sealed originally, I'm sure it would have been a little better off, but, as you know, still not bullet proof or impervious.

If you haven't yet used it, then it's gotta be something with the installation.

KevinMP-thank you for your response. Bathroom has had no use from us yet. To make matters worse this is the 2nd counter top that the fabricator has had to fabricate for us because they messed up the first one beyond repair:(
Not sure how the fabricator is going to want to handle this issue. I have to assume it is coming up from under the counter & has to do with the installation. Ick!

picture of spots = looks almost like round shadows

Will have to work on getting image to upload tomorrow:( Not working for me tonight.