10 month Easter egger has a 4-5in round raw area and deep pocket/flap of open skin that reaches from her back down her left side. May originally be from an ambitious rooster. If so, he all but skinned her over time. It smelled terrible and was covered in a gray dead layer. She was acting 100% normal and her wings covered it, so I did not know to check until late last night. Not sure how long it was there. Feeling simply awful about it. Took her to to the vet first thing this morning and they cleaned it well (it's now mostly raw/pink exposed tissue) and gave us Granulex V spray to use 2-3x/daily to remove the remaining dead tissue. Instructions are to leave it open to drain, clean it 2x daily until dead matter is gone and 1x daily after that, irrigating the pocketed area frequently with cleanser-dipped Q-Tips and hope the skin reattaches. She's isolated in the house with us and is wearing a cone to keep her from pecking; her wing is wrapped to keep it off the injury. My question is this: the vet said "unfortunately we don't really have any antibiotics we can use on chickens, just topical treatments." I'm not sure if she meant for this particular ailment or not, but I'm baffled. I thought chicken antibiotics were all too common? The pocketed flap area is about the depth of my finger (i.e. prone to keep infecting) and I'd rather she have also have systemic/internal help fighting this. Can I get something OTC or from an internet source for her? She is eating/drinking/acting normal - even vet commented on this, so no fever yet. But I don't see how this won't become that if left much longer.