Feathers gone on backside?

[LittleMissCountry]

One of my buff orps is missing her fluff from her backside. It happened pretty quickly, because I didn't notice it a few days ago, but noticed it today.

There are no injuries, no lice or mites, and she is eating and drinking normally, and laying eggs.

I am attaching pictures of her with the other chickens, for comparison. I tried to get a close up, but she runs from me.

She did lose a bunch of feathers about a month ago, but not from her backside. You can see that the new feathers growing in are lighter colored.

Any ideas what might have caused her to lose her fluff?

 

[coach723]

Since she lost a bunch of feathers a month ago, and new ones are growing in, I'd say it's just part of molt.

 

[LittleMissCountry]

I was wondering if that was it, since there doesn't seem to be any other cause. Thank you.