The discoloration you notice is because the liquid/moisture damaged the backlight layer of your screen.[br]
No actual electronic components seem to have suffered damage.[br]
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Your MacBook will probably keep running normally (depends if some liquid-moisture actually made it to the LCD, corrosion could build up slowly over time and damage the LCD, but it seems like everything dried up)[br]
The only way to fix this is by replacing the full display assembly..