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Um, no, that is something that is often misunderstood on here. It's a bit of a long explanation, but here goes.
What is toxic to chickens is the "caine" group of drugs, used to numb. Includes drugs like, cetacaine, lidocaine, benzocaine -- you get the idea, there are a bunch of them and they all end in "caine." The problem with these drugs in chickens is that the therapeutic dose is very close to the toxic dose. Chickens have actually died from using an ointment with one of them in it. "Caine" drugs are also used in some wound cleansers and in OraGel for toothaches, so it's good to know about this.
The pain reliever in the brand name Neosporin, and the generics I've seen, is a completely different class of drugs, remotely related to morphine or opium. It didn't bother my chickens a bit.
And I agree, the main thing is to get the maggots out and prevent flies from laying any more eggs in there. Simple first aid, clean it and use something like Neosporin, should do the trick then.