Help! What’s wrong with my chicken?

[Bear4boo]

Help! What’s wrong with my chicken?
The first pic shows the area on her butt clear but the other pics actually show how red it is.

 

[asokatonu]

Well first of all what breed is she, how old is she, have you checked her for mites, and is it possible that someone else in her flock plucked her?

 

[Wyorp Rock]

Looks like she's being plucked.

Apply some NuStock Cream or Hen Healer to help heal and soothe her skin.