Uggh Moisture in my iPad

Left my iPad out on the porch and it got a light rain on it.

I put it in a bag with rice like a lot of folks suggested, and I took it out yesterday after two days.

It powers up and works, but the screen has areas obviously shaded in some areas from moisture.

What can I do to fix this? Will it cause the screen to go bad if I use it? I shut it right back off.