What Causes Bruise On Face?

Hi, my name is Katie. I woke up about four days ago with a small bruise on my face. I have had no injuries and have not been hit in the face at all. The next day another one appeared beside it and the other bruise I originally had got worse. Today i woke up and ther was yet another bruise above it and the other two bruises are getting worse. The whole side of my face is very sore. Any diagnosis?