iPod touch Need Help With My Itouch/Scratch UNDER Screen

Hello guys I am new here glad to be here. I have a first gen itouch, still works fine, but i was dumb and dropped it. The itouch is fine, but there is a screen scratch, not on top of the glass like people get, but a scratch on the LCD. Looks like a fish, its just little lines in the screen that have white behind them. Small,about an inch of so. Do any of you guys know what this is? My main question is can it spread? Or will it stay put. The scratch now is fine, I can still use my itouch fine, but my concern is that if it spreads over time. I hope I said clearly what it was. Its a line scratch in the screen, not the glass creen, the LCD part, and it just makes like 5 lines that are stacked. A half inch form top to bottom. If it dosent spread I will be fine. Any thoughts?