Raw undersides.

[Annie6oh]

Help please we’d had chickens for five years, and last winter, housed then with a farmer. One was picked on by the rooster, and here been brooding since she’s come back in May. She has now developed a red raw underside and another one has a raw patch near her tail feathers. All four are constantly taking dust baths.
Not sure if cause or what to do to treat. You’d advice would sure be appreciated!

 

[sourland]

Can you post pictures? Have you checked them for lice/mites?

 

[Pork Pie]

Hi and welcome to BYC. Good luck with your bird.

 

[Madhouse Pullet]

Welcome! I wish I could suggest some help but I have no experience.
You can also try posting here: https://www.backyardchickens.com/forums/emergencies-diseases-injuries-and-cures.10/
There may be more knowledgeable people around that part of the forum who may better assist you.

 

[DobieLover]

Hello and welcome to BYC! Glad you joined.
Pictures will help.

 

[Grammy60]

Hello and welcome to BYC Best wishes for your birds

 

[Fuchsia]

Welcome to BYC!

 

[TwoCrows]

Hello and welcome to BYC!

Sounds like more rooster mating? I would definitely follow the link that @Madhouse Pullet has left for you to the Emergency forums, and have some photos ready so they can see these spots. Good luck and welcome to our community!

 

[drumstick diva]

agree with Two Crows.

 

[N F C]

Hello, hope the folks over on the ER forum can help!