I got my iPhone 5 wet and now has coloured lines?

A few days ago, I got my iPhone 5 wet and left it in a bag of rice for a few days. Right now it functions perfectly, but it's just that the screen shows different coloured lines which are horizontal. If i leave it on a table for a while, I'm able to see the screen, but 3 seconds later the coloured lines come back. Someone please help.

Get it to the nearby iService center

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