I had the same issue on my Touch HD, within the space of the first two or three years. Interestingly that happened only on the front frame, and not on the back. I suspected it may have something to do with a reaction with skin grease or sweat. I simply removed the gum coating gently with acetone, leaving the clean hard plastic behind it, and that was it. I would recommend care not to spill solvent on the screen itself, though it may be even resistant to diluted acetone. On my reader the plastic base is black as the coating, and the substrate is flat, so the aesthetics was not a bit affected by the wipeout.
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