Greeting
CCUK,
You can treat the water for all of the flock to drink. Denagard (Tiamulin Hydrogen Fumarate) has no egg withdrawal. However, it has a terrible taste, so you should mix some apple juice concentrate into the water. I use 1/2 can of apple or apple and berry frozen concentrate.
It is possible to use it as a drench, but, it isn't recommended. This medication can be dangerous without proper dilution in water!
It is interesting that your vet identified the lesions as abscess. An abscess usually occurs when there has been an injury that has become infected, then sealed in by the skin. The infection then fills the site with pus.
You describe a lack of pus and instead point out the "yellow meaty chunky nastiness, no smell". Abscess are usually warm/hot to touch, and painful, some have a smelly pus. The chicken will also feel sickly.
Your chicken has too many to be abscess from injury, although it is possible for feather follicles to get infected. However, the lump under her eye, is suspicious. There is not evidence of pecking injury, and that is a featherless area of skin.
Since the chicken is acting normally, it may be some type of fatty tumor. All I know is what I have read. But, here is some more information on the condition. You can decide for yourself, if these are abscess or something else. Your description of the material inside the growth you removed, is also described in the following article.
https://wagwalking.com/bird/condition/lipomas-
These are my thoughts on your chicken's health issue. I hope I have been helpful.
God Bless
) sounds like chicken puss and would point to an infection.
