I don't know how else to describe it. I've had a Spec case on my laptop since new (about 4 months) without taking it off. I just took it off to swap the hard disc and found lots of dark splodges of what looks like mould - each splodge being a few millimetres in diameter. Under each one there is a tiny physical dint in the aluminium!!! It's not a disaster at the moment because you can hardly see them but I guess it could have been bad if I had left it much longer. Anyone had this before or know anything about it. I guess I've just got to make sure I take the case off every now and again and clean it.