Hi, I bought the old generation iPhone this April and have been using it ever since. Suddenly there are a few blemishes in the screen, I don't know how to explain but they look like pinholes as in somebody pierced the screen with a pin. I am not able to feel the holes (they are that small) but they are very much visible. My question is has anybody encountered such a thing before? Will Apple replace my phone with a new/refurbished one (My Limited Warranty which came with the phone purchase is valid till next April. If yes, can I take my phone to an apple store? Thanks for reading!