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You could open all flaps and try to heat the device up by playing games or having it record videos etc however if that fails then I'm sorry to hear this but you would need to either return your device to the place of purchase or contact Xperia care and have your device inspected http://www.sonymobile.com/global-en/support/contact-us/
Just be careful not to apply the heat to close to the LCD as you can burn it as I learned many years ago when I started to repair phones, If you really want to dry it out then you would take it apart and check under the heat shields on the mainboard for trapped water
They clip off unlike some phone where they are soldiered on