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It appears that she has a leaking air sac, also called subcutaneous emphysema. Does she have labored breathing? I had a chick with that after she was injured, and I used a needle inserted under the skin and then pushed the air out. It may take more than one stick in different spots. After the air is pushed out, hold pressure over the needle site. An 18 gauge needle is best, but I used a smaller 22 gauge needle because that was all I had. The air can re-appear, and it may have to be repeated. Let us know what happens. If you want to read about this, Google "leaking air sac in a chicken."
Thanks for your response. Her breathing seems normal, everything about her is normal except for the air sacs. She is eating and drinking, appears alert and aware of her surroundings, and is active. I had heard of popping the air sacs, but I didn't want to cause an infection. Should I use some kind of medicine on her to prevent any infection? Her brooder is relatively clean, and is indoors, but I wouldn't want to take any chances.
Here is a good thread with more links included to help about treating a leaking air sac: http://www.backyardchickens.com/t/889866/is-this-a-ruptured-air-sac