I have been using an official Apple iPhone bumper on my iPhone 4 for quite a few months now. Took it off for the first time in a few weeks and noticed a small what at first I thought was a scratch on my phone, I suddenly realised it might be a small crack in the top corner near the camera. It is underneath the glass, you can't "feel" the scratch. I just wanted to know if this is covered under the warranty that Apple offer. As I would go and get this repaired if it is. But having had a repair earlier last year for a pixel drop in my screen I am a little confused as to whether this will be covered. I'm sure it's not from misuse. As I have a few little scratches from general usage. I know for a fact that I have not dropped it to do this damage.
Any help is appreciated.