Check this thread and links provided in it: https://www.backyardchickens.com/forum/viewtopic.php?id=357671&p=1 (med. etc.)
Your State might (DNR/AG) be able to help you out with this. However, other poultry folks, from Mich., on BYC, might be able to provide info from their own experience. Symptoms of other diseases can look like Blackhead. Do not assume. From your description of symptoms it could well be he has a mechanical blockage of some sort.
slc is right on the money (fishzole/metronidazole/flagyl - all the same and the best one can do as dimetridazole is no longer available) IF your poor guy has blackhead.
Good luck!
Your State might (DNR/AG) be able to help you out with this. However, other poultry folks, from Mich., on BYC, might be able to provide info from their own experience. Symptoms of other diseases can look like Blackhead. Do not assume. From your description of symptoms it could well be he has a mechanical blockage of some sort.
slc is right on the money (fishzole/metronidazole/flagyl - all the same and the best one can do as dimetridazole is no longer available) IF your poor guy has blackhead.
Good luck!