Chicken bald spot

[kmurray2501]

Hi, one of my chickens has a bald spot on her chest and a small one coming on her bottom. We are unsure if this is caused by mites? We have been cleaning the coop regularly with powder and spray. I also read about molting as it looks like she has pin feathers? But I am not sure of the molting process? Another hen, that has recently started laying, has also begun to get a small bald spot on her chest.
I have attached a picture below, we have now put a little chicken scarf on her as the spot was attracting our other girls to peck which we think has made it worse.
Can anyone advise me further? Thank you

 

[sourland]

Some bird/birds in your flock are feather pecking/plucking the new feathers that are developing.

 

[nuthatched]

Looks like feather plucking, it could be a sign of too little protein in their feed or too little space. or boredom

 

[kmurray2501]

Some bird/birds in your flock are feather pecking/plucking the new feathers that are developing.

How can I prevent this?

 

[chickenmomandmygirls]

How can I prevent this?

May not be a "cure all" but someone correct me if I'm wrong: there is protein in the white part of a feather. I purchased turkey starter grain in the winter months (28 % protein). I've got 11 girls. Every other day I mix 1 cup of this with their regular layer food and moistened cooked oats.