Featherless bum?

[yellowjacketgal]

I purchased four Easter egger pullets from Tractor Supply about two weeks ago. One of them doesn't have any feathers on her little black bum. Should I be worried, or is this normal for this type of chicken? Is it maybe pasty butt?

 

[Obsessed With Silkies]

The picture is hard to tell but I wouldn't worry about it; it'll feather in