So... my 5s has been in a case since I got it, and I took the case off to change to a different one, and noticed my phone has a slight circular bulge on the back. It is on the left side right about down the middle of the phone beneath the camera flash. I figured it was a scratch, but it is pertrudes out on the metal body, not into the body. I thought I was crazy running my finger over it and feeling a slight bulge, but when I placed the phone down on my desk without a case, sure enough it isnt flush. It wobbles slightly when pressed on the right side of the phone (furthest from the bulge). Honestly, the physical imperfection doesnt bother me, but could this be the battery bulging or something like that? I dont want the battery exploding on me or anything lol. The phone is only about 2 months old since my previous phone was replaced for signal dropping issues. I would take it to the apple store, but I dont want them to look at me like Im crazy obsessing over a tiny bulge.