two of my chickens have gone bald near their vent, under it really in a big batch. Is this a bad sign?
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I agree with redsoxs.It's not a good sign...may be mites. You should post in the link below for more advanced help. If it is a parasite you will need to treat the whole flock. Good luck to you!
https://www.backyardchickens.com/f/10/emergencies-diseases-injuries-and-cures