PLEASE READ! Guinea keet with strange growth and is dying

[Liv's chickens]

Hello, I Have a have a Guinea keet that I got almost a week ago and has had constant pasty butt and also has a strange “growth” like thing near its vent. I soak and clean the keet up many times a day and it has seemed healthy but today it definitely looks weaker and I really don’t know what this thing is near its vent. I’m a first time guinea keeper, though I have had chickens for over 5 years. But this is quite strange and At first I thought it was where it’s “Umbilical cord” was from when it was in an egg but I don’t think it’s not in the right place for that. I have pics below. Please help quick for I’m worried that the keet will die soon. Any help or thought would be very much appreciated. Thanks

 

[Pyxis]

Can you post a picture of the growth?

 

[Liv's chickens]

Yes sorry. Haha I forgot to post the pics. Here they are

 

[Liv's chickens]

It only let me post one picture.. let me see if I can post more..

 

[Liv's chickens]

And you can also see that its really weak now with wings dropping and usually eyes closed.