I've searched around and saw a few mentions of other chickens that have had a bruised eye, but in those cases, they were talking about older chickens and any number of diseases so I don't really know which direction to go.
I recently (2 to 3 weeks ago) picked up 5 chicks at Orschelns; 2 Barred Rock pullets, 2 New Hampshire Red pullets, and 1 Buff Orpington pullet. The buff has always been a little bigger than the other 4 and it seems to be the one trying to be top dog in the pecking order. It'll charge the others, stand taller than them, etc. She's essentially a bully, but butter in my hands when I hold her. Two days ago, I noticed her eye looked bruised. I don't know if this has to do with her losing her chick fluff around her face and getting adult feathers or if this is something with which I need to be more concerned. I've been feeding them 18% medicated chick starter, keeping their living quarters clean, and well watered and fed. One other thing I did do that may have been too soon was treating them with meal worms. All of the chicks had some, but she's the only one with this "bruised" eye.
She hasn't been acting differently, still eating and drinking with the other chicks.
Is it possible that there was a rebellion by the other 4 and they had a school yard beat down? I initially thought it was maybe blood on her feathers around her eye but have since decided that wasn't it as I couldn't see any type of wound. I've understood that chickens like to peck at blood or red things. (not sure if there is truth to that)
Anyway, I've attached a picture. It's a little blurry as I had a hard time getting her to hold perfectly still, but I would appreciate some input on what others who may be more experienced might think this is.
Thank you for any help you may offer,