Extremely Large Abscess on Chin's Neck

I adopted what I was told was a healthy 7 year old chinchilla Athena, and then I discovered a large abscess on her neck. She is going into surgery today to remove the sac and drain the area. I would appreciate any follow up advice for post-op care. Please also take a look at this page I made for her visit today, it would mean a lot.
http://ift.tt/2EASIeG