Hi
I have the same exact problem(his vent looks exactly the same) but this is a rooster(8 months old)and his is medium sized prolapsed.
I have been soaking 3x a day for 3 days and it’s still the same
Nothing comes off and the vent won’t be pushed in(too hard)
I have been using Vaseline and anti biotic cream.
He eats,poops and drinks ok
Also not lethargic.
Not over crowded or picking by others.
I will keep doing what I’m doing but wondering what it is or what caused it.
Welcome To BYC
You have replies to your thread, did you see them? They can be found in the link below.
https://www.backyardchickens.com/threads/rooster-prolapsed-vent.1673281/#post-28755432