Well, sorry to say it has water damage.
Put it in a bowl of dry brown rice. Rice absorbs the water. When you do this, take the battery out of the back and leave it in the bowl as well and keep the back off the phone.
If you have insurance, you may want to file a claim - if it covers water damage. If not, accidentally forget it somewhere!
The store knows how to check for water damage - there is a dot on the back that changes color. Some times the dot is inside the actual casing to prevent customers from tampering with it.
Try this and hopefully it will work for you. You shouldn't have blown dried it because it could fry the wires real easy. It's tiny little wires and circuit boards in there - very sensitive.
Good luck!