I-phone 11 got wet

Hi. I had my iPhone sitting on the outdoor furniture when it started to pour, when I came back for it it was sitting in a puddle of water that had formed on the cushion. It could not of been there any longer than 3 to 5 minutes. Now there is a dark area where my home key would be and it started glitching last night. Including removing all of the brightness from the screen making it hard to see/use. Has anybody had this happen? Is there anything I can do to fix it? I’d really love not to have to buy a new phone.