Hello, I apologize for the poor quality of the photo. But this grey squirrel is visiting my yard today. There is an inch-long open sore/wound on the right shoulder area, but even worse is the swelling/lump on the side of the face. This is a fiesty one, still able to eat and is chasing the others away from the nuts I put out. Is there anything I can do on my own before I try to find a rehabber? Thank you.