I don't know how to post pictures. Should I dunk in sulfer again? That has worked tremendously well for mites in the past.
It could be an infection. I have antibiotics, but I hesitate to give that unless I'm sure.
Hopefully, someone can help. Our hen was mated with excessively by our roo, breaking her feathers off; so we removed her. Then, on her back at the root of the feathers started a red and swelling bump. Now, she has 4 of these swollen areas situated on her skin at the root of the feather. They are...