I have a hen that had a little "poopy butt" recently...didn't think much of it...Today I went out and her whole back end was wet and black and crawling!!! I hosed it off and found a large wound just below her vent about three inches round. It was soooo gross, full of maggots that did not want to come off. I think I got them all, but is there anything I can treat it with that will insure all the maggots are killed? I have washed and washed the wound and covered it with a lot of antibiotic ointment. Any other suggestions? She is now in a horse stall that is fly free(she normally free ranges and goes in the coop at night). Thanks for any info.