I noticed some very small blue traces on the front aluminium edges of my iPhone 5. Should I be worried? It kinda looks like the metal was colored blue in that tiny tiny spot. I tried to scratch it away with my fingernail but that didn't work. I tried with a damp piece of tissue and it didn't work either. And then this morning I tried to rub it with a bit of vodka, it's still there. Should I be worried? Could this be a battery/component leak or something? Or should I just ignore it?