Odd Cal Towhee query


I had a Calif. Towhee in my yard yesterday with what at first looked like a black eye. On closer inspection it looks like most of the right side of the face was dark gray and that the feathers were missing. There was a distinct edge and depth difference along the edge with normal feathers. I ruled out wet feathers, and melaninistic spot. Anybody have ideas of what caused this?

Judi Sierra- Oakland