Hey y'all. I have an iPhone 5, and you know what they say. IPhone cases are like condoms. You really don't want to but you kinda have to. Anyways, I noticed when I took my iphone out of otterbox to clean case, there are these little spots on the sides where the aluminum is where some of the aluminum paint is missing. It hasn't done any damage to the phone because my power button stopped working on my last one, and at the apple store when they looked at my phone they replaced it free of charge (being that I have AppleCare, of course.) but I was just wondering why does this happen? I live at the beach, could it be little grains of sand getting trapped in the case and rubbing against the sides?