Can anyone identify what this is? My friend got this chicken a week ago and this abscess has increased even since this picture and is now oozing. What type of home care can I provide? Can it survive?
It looks like she has an ear infection. A few of the more common causes can be from insect bites, lice/mites, pecking wound/injury and respiratory illness.
Some people do treat themselves, instructions are in the links below.
Also check her over for any external parasites - if you see any, treat her with a permethrin based poultry dust or spray.
Hopefully if your friend already has an existing flock, she has this chicken in quarantine and has some bio-security measures in place.