Use a hair dryer to warm the screen. Keep moving it back and forth over the discolored area until you see it shrink. (It may not go completely away at this point, that's okay.)
Place the phone in a Ziploc bag, and place it in your refrigerator. Leave it there for 20-30 minutes.
Take phone out of fridge, let it warm back to room temperature.
Replace SD card, battery, and back. Reboot.
Profit.
This happened to me when my wife borrowed my Volt, put it into her back pocket, and sat on it. Doing the above worked like a charm. Also worked great on another Volt belonging to one of my students.
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