Help! My chickens wing is green!

[Crusty Duck]

I have a young hen that got attacked by a dog a couple weeks ago. She has some bite marks and a injured leg but she seems to be getting better. Then last night I noticed her wing is green. Here's a picture

Is it infection or a huge bruise?

 

[ButtonquailGirl14]

@casportpony !!! It looks like a bruise to me, but I'm really not sure!