Why is my chickens back red and swollen? ( Under vent)

[Josip]

She have Like big red bump under vent?
She have it for 2 months she eat fine,lay 5 eggs / week.

 

[Wyorp Rock]

How old is she?

I would also check her for lice/mites, but it looks like feather picking.

 

[Josip]

How old is she?

I would also check her for lice/mites, but it looks like feather picking.

She is 3 yearz old..and lice or mittes

 

[Wyorp Rock]

She is 3 yearz old..and lice or mittes

She does have lice/mites?

 

[Josip]

She does have lice/mites?

No she does not