Bird is pecking at herself and drawing blood ?

I have a Rhode Island Red and she has been biting herself at the bottom of her belly. We thought she was molting or something like that but it's gone on for very long and no longer think its a usual part if a molt. She doesn't really have many feathers down there but she bites at what looks like a little scab. It's a little spot and she pecks at it every couple of days, and when it draws blood it gets very messy. The other girls don't bother her which is a major plus but she doesn't get any better with whatever it is she has. Her beak is always covered in blood and we usually out something on it so she stops pecking, but it's only for a short time until she starts again.

Anyone know what it is ? Got some pictures too. The last two are the clearest of the scab, and there is some flaky yellow skin I noticed as well closer to her chest on the other pictures. Thanks

 

Well there is a feather that comes out of that scab, and yeah it is hard to tell. I don't even know if its infected or ingrown or what, just looking for some suggestions I guess

 

What are mites? How can I tell of she has them and what is seven dust? Sorry never had to deal with it before.. Is there any food I can feed her to fix it if it is a mite or worm or parasite? I don't think this is apart of the molting process..

Also my Ameraucana has a slightly broken beak and I'm getting very worked up over this, how can I deal with this? My Ameraucana is our sweetest girl.