Pecked neck?

[heather134]

In the past several days, I've spotted three hens (out of ten) losing feathers on the back of their necks. Other than feather loss they seem perfectly healthy, eating / drinking / laying well. One is the youngest and usually picked on, and she has it worst:

The other two are both Welsummers who are usually not bullied, and are always at the top of the roost:

Is it likely pecking? If so any suggestions for limiting it or helping the girls with the bare necks?
If it's something else, thoughts on stopping it? I couldn't find anything crawling or signs of eggs.

 

[sourland]

Another bird/birds in the flock is/are feather pecking plucking them. Most likely those in the best feather condition.

 

[heather134]

Thanks! Poor babies, I wish I could give them little scarves or something to protect their necks.