Could be. Her bottom was quite clean today but could have become irritated before. She's so fluffy you can't see the missing feathers when she's walking around.
I have 4 Light Sussex hens about a year old. A couple of them have had slightly poopy bottoms since being let out to free range about a month ago. droppings are mostly normal but sometimes quite wet.
Yesterday and noticed one has an area of missing feathers below vent and the skin looks...