Here is what I found on my girl so you can compare. She definitely had/has lice. I really freaked out when I saw it and sent a picture to my friend. She told me lice and told me to go get Sevin and dust them with that. Well, I did it unfortunately. I was trying to keep them organic for my own consumption, so I was upset later when I realized I used a pesticide. Ugh. It didn't even work well. I wanted a natural cure. I researched and got some advice here at BYC and on this link. There is a great YouTube video on dust bathing them with wood ash. I did that next. Since it was so d*#ned cold outside I set up the saw horses in the garage with a partial sheet of plywood, and a big bowl of the finest wood ash. (I used a screen and rubbed the fireplace ashed through it.) You need to be extremely careful doing this and the hens need to stay calm or you will end up with ash all in the air and breathing it yourself. If you hold their wings down firmly and lay them on their back (making sure to keep the ash away from their head). You will have to turn them on their sides, etc. My daughter helped me keep their heads up out of the ash on the board. Do yourself a favor and get a mask for your mouth and nose or put a bandanna over them. I did mine at night when they are calmer but one still managed to flap her wings a little. The wood ash seemed to work great. Unfortunately, I went away and did not get back soon enough to re-dust them. Yes, you will need to re-dust them because the egg sacks that (if yours are lice) will hatch. Then make sure you have a bin in their coop/run where they can dust bathe themselves. I just added another dust bin/sanitized old kitty liter pan and added dry sand, wood ash and "food grade" (very important) Diatomaceous Earth because I think they needed more than just the ash. I also had one hen who would get into the one bin that had sand and wood ash only and not get out, so none of the others could get in. The other thing is that you MUST make certain that these dust bins do NOT get wet. Once wet they will not work. This is what I've learned so far. If, indeed, they are lice I have read that they do not live "off" the bird, so you do not need to treat your whole coop but you should get any loose feathers out because they could have egg sacks on them. WARNING: This is just what a have learned lately, so you are not getting expert advice from me; just what I have read/been told. Mine definitely felt better after being dust bathed by ME thoroughly. I just should have kept dusting them after a few days a couple times.
If you are dealing with mites, then they live off the chicken and your coop will be infested and need to be completely cleaned. I have a web site that should help you: http://naturalchickenkeeping.blogspot.com/p/blog-page_6930.html and this one is good too: http://www.fresh-eggs-daily.com/2013/02/mites-how-to-prevent-them-and-treat.html
Good Luck. Mine are looking better but still working with them.

