Little chicks bloody around eyes and throat...internal blood. what would cause this?

[bigbadwolf38]

What causes chicks to get bloody around eyes and throat...internal blood?

 

[ten chicks]

What causes chicks to get bloody around eyes and throat...internal blood?

Peck from another chick,scratching themselves.

 

[bigbadwolf38]

Here are some pics of the worst one...

[/IMG][/IMG]It almost looks like it's swollen. not pecked at. We've had them for a week, and this is the first I've seen. There are 8 and only 3 have this problem. I was wondering if it could be something they ate, but wouldn't it affect the whole lot?