That sounds like freezer burn.  It's why all food products should be 
wrapped, and not come into contact with the freezing air directly. 

http://www.loc.gov/rr/scitech/mysteries/freezerburn.html

http://www.cfsan.fda.gov/~dms/qa-sto3.html

Safe to use, if freezer burn, but babe may not like the taste

Morgan Gallagher

Linda Hill wrote:
> If the spots were on something I found in the refrigerator I would think it
> is mold, but I'm not sure how that would be possible since the milk has been
> frozen. The cubes are about 3-4 weeks old. I did take the ice tray out once
> about a week ago to make the transfer to the bags but put it right back in
> the freezer when I realized I didn't have time to complete the task. I'd
> hate to have to throw them out, but don't want to give Irene milk that has
> gone bad."
>   

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