What should I do about 'rainbow spots' on my Iphone screen? Newton Rings?

I have noticed rainbow spots on my three-day-old Iphone 5C. From the front, they look small and minor, but when it is tilted, they appear larger. Should I bring them back to the store and get ask for assistance, or is there something I can do from home with little knowledge of the phone? I first noticed them yesterday and I have had the phone under sunlight. Should I just not bother and leave the dots there?

I can't find a good picture online, but they look like the little oil-on-water spots you see on the sidewalk sometimes. It won't show very well on camera.

Thanks for your help!