What are the spots that are appearing on the back of the iphone 5s?

I have had the iphone 5s since launch day.  about a week in i started to notice little white dots on the back of the phone. ( i have been using a bumber case with a clear back) the white dots are mostly on the bottom part of the iphone on the black section.  some of the dots have showed up near the apple emblem. i have taken a scribe and carefully tried to scrape it and some of it comes off but its back within a few days.  Does anybody know what this could be?

UPDATE:
I have four accounts on my MacPro (which hosts the server). Server/Local/Basic Administrator and Dummy Acc (SA, LA, BA and DA respectively). Only SA and DA are in the OD (as per standard server setup assistant); LA and BA are on the local account of the computer, not the server's OD.
When I login with and of the SA, LA or BA users locally, or SA remotely evrything appears as it should. It is only when I log in with DA, which is fully managed within WGM (Finder, Dock, Apps), that I get odd behaviour.
DA behaves as expected on client Macs but the Dock management settings, at least, don't appear to work when logged in on the local server machine.
Once I have logged in as DA on any machine (and then logged out or not) and then log in with any of the Administrator accounts I get this Boot OSX harddrives appearing, as previously described.
The Boot HDs then seem to no l;onger appear after some unspecified period of time with the server logged out of by all accounts.
None of this affects the performance (as much as I can tell).
Any thoughts? Is the Boot OSX some NetBoot type thing (which I haven't touched). Why is this behaviour associated with this dumb account?
Many thanks,
Francis.

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