Bare Butt? Can anyone identify this?

[Stedman]

two of my chickens butts look a little bare and red. They are acting and eating normal has anyone run into this?

 

[Laineybug]

Kinda but not quite. I have had some bare bottoms but not like this. they could be going through a very odd molt, I have had some bug/parasitic like mite/lice actually that has pulled and chewed off feathers. Could others be pecking at her for some odd reason? She might also have pulled them out herself trying to removed poopy feathers