Naked bottoms and picking at each others vents

[jrindenver]

I'm not sure what is going on if anybody has an opinion or knows but the hens are feather picking each others butts and around their butts and one of them is bloody. I don't see anything and I'm not sure what this is at all? Help from anyone please., thank you Jr

 

[jrindenver]

I'm not sure what is going on if anybody has an opinion or knows but the hens are feather picking each others butts and around their vents and one of them is bloody. I don't see anything and I'm not sure what this is at all? Help from anyone please., thank you Jr