Hi there, I'm so grateful to follow this forum and learn so much about taking care of chickens. 
I usually read and not post, but today, I need help.
BTW : I'm don't speak fluent english, so I may do mistakes, sorry about that.
It's been since June I have 13 chickens. 2 of them were eaten by racoons. 2 of them died for unknown reasons.
And today, I see the only rooster I have, on the side, shaking and very weak.
I panicked a little bit, took him to my house, in the bathroom. And as I saw his face covered in mud and dirt, I gave him a bath and cleaned his face.
This was after that, that I saw this post :
https://www.backyardchickens.com/th...d-supportive-care-updated-01-17-2021.1048620/
(and that I shouldn't have give him a bath
)
Well guys I need your help. I don't want anymore of my chickens to die without me doing nothing about it.
As I want to follow the forum's rule, here are my answer to every questions I should ask :
1) What type of bird , age and weight (does the chicken seem or feel lighter or thinner than the others.)
Rooster, about 9 months old
2) What is the behavior, exactly.
I saw it walk and heared it yell when it was picked by the others (it often is a victim to some other chickens in the coop).
Then a few seconds after I saw it lying on his side on the floor. It seemed week and one eye was closed.
3) How long has the bird been exhibiting symptoms?
I saw it do that when I opened the coop 30 min ago.
4) Are other birds exhibiting the same symptoms?
No
5) Is there any bleeding, injury, broken bones or other sign of trauma.
Yes. I found a blue feather stuck around its tall sickle (i don't know if I use the right word tho).
I removed it.
I also found some weird skin coloration in that area (see picture enclosed)
And he has one eye quite red with bubbles in it.
6) What happened, if anything that you know of, that may have caused the situation.
I haven't been regular in cleaning the coop. Their spot where they sleep is dirty and I added some straw on top of it twice.
Also they don't have a sand box to clean themselves.
7) What has the bird been eating and drinking, if at all.
Drinking water and apple cider vinegar
Eating regular bio brooding mix and dried black soldier fly larvae.
8) How does the poop look? Normal? Bloody? Runny? etc.
I compared poop. I didn't check for worms but it seemed ok.
9) What has been the treatment you have administered so far?
None, just eating and drinking on the bath.
10 ) What is your intent as far as treatment? For example, do you want to treat completely yourself, or do you need help in stabilizing the bird til you can get to a vet?
I want to treat him completely by myself.
11) If you have a picture of the wound or condition, please post it. It may help.
Enclosed.
12) Describe the housing/bedding in use
It's an old shed that I converted as a coop. I'll make pictures to send it to you in a moment.
Its correct side, eye is ok. It just has food in its beak.
Bad side. Eye is red, often closed and bubbles in it, do you see it?
Tail coverts. Seem like a parasite?
Thank you guys a lot for help.

I usually read and not post, but today, I need help.
BTW : I'm don't speak fluent english, so I may do mistakes, sorry about that.
It's been since June I have 13 chickens. 2 of them were eaten by racoons. 2 of them died for unknown reasons.
And today, I see the only rooster I have, on the side, shaking and very weak.
I panicked a little bit, took him to my house, in the bathroom. And as I saw his face covered in mud and dirt, I gave him a bath and cleaned his face.
This was after that, that I saw this post :
https://www.backyardchickens.com/th...d-supportive-care-updated-01-17-2021.1048620/
(and that I shouldn't have give him a bath

Well guys I need your help. I don't want anymore of my chickens to die without me doing nothing about it.
As I want to follow the forum's rule, here are my answer to every questions I should ask :
1) What type of bird , age and weight (does the chicken seem or feel lighter or thinner than the others.)
Rooster, about 9 months old
2) What is the behavior, exactly.
I saw it walk and heared it yell when it was picked by the others (it often is a victim to some other chickens in the coop).
Then a few seconds after I saw it lying on his side on the floor. It seemed week and one eye was closed.
3) How long has the bird been exhibiting symptoms?
I saw it do that when I opened the coop 30 min ago.
4) Are other birds exhibiting the same symptoms?
No
5) Is there any bleeding, injury, broken bones or other sign of trauma.
Yes. I found a blue feather stuck around its tall sickle (i don't know if I use the right word tho).
I removed it.
I also found some weird skin coloration in that area (see picture enclosed)
And he has one eye quite red with bubbles in it.
6) What happened, if anything that you know of, that may have caused the situation.
I haven't been regular in cleaning the coop. Their spot where they sleep is dirty and I added some straw on top of it twice.
Also they don't have a sand box to clean themselves.
7) What has the bird been eating and drinking, if at all.
Drinking water and apple cider vinegar
Eating regular bio brooding mix and dried black soldier fly larvae.
8) How does the poop look? Normal? Bloody? Runny? etc.
I compared poop. I didn't check for worms but it seemed ok.
9) What has been the treatment you have administered so far?
None, just eating and drinking on the bath.
10 ) What is your intent as far as treatment? For example, do you want to treat completely yourself, or do you need help in stabilizing the bird til you can get to a vet?
I want to treat him completely by myself.
11) If you have a picture of the wound or condition, please post it. It may help.
Enclosed.
12) Describe the housing/bedding in use
It's an old shed that I converted as a coop. I'll make pictures to send it to you in a moment.


Bad side. Eye is red, often closed and bubbles in it, do you see it?

Tail coverts. Seem like a parasite?
Thank you guys a lot for help.
