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I noticed my iPhone looked like this about two weeks after I got it. When I went with my mom to purchase her iPhones, I had them look at it for me. Well, the guy that was selling the phones to my mom took it and had a Genius look at it. He came back and said that it wasn't a problem. Honestly, I think they were just shoving me aside because this was still a time when the iPhone was selling out daily and they were VERY busy. I didn't personally talk to a genius. Big mistake.
Fastforward to a couple months ago. I was cleaning my iPhone and I swore that I felt and heard my screen click. I figured I was just hearing things. It happened again last week and I figured out the "trick" to making it click. Well, I went to the Apple store this weekend and got it replaced. I told him that I was concerned about the rubber when I first got the phone and that I think that's what is causing the click. Well, the first guy who looked at my phone didn't document that I had it looked at. So, the Genius from this weekend wad hesitant to believe me since I did have a ding on the plastic. He said he could put the blame on me, but was nice and gave me a refurb anyway.
Anyway, all this to say that I think you should take it to the Apple store and at least have them document it. That way if you have problems in the future, they can't blame you. But I honestly believe they'll replace it for you anyway.