Chook with dirty bum. Sign of illness?

[Present_Ability_3955]

Hi all, we're in Australia have a few Hy-Line Brown POL chooks that we've had for a few months.

They generally seem pretty happy, laying pretty well, have plenty of space to run around and they are much loved.

However, we've noticed one poor chook seems to have a dirty bum with dried crusted poo embedded into the feathers (photo attached below) and she tends to isolate herself from the other chooks to a degree but otherwise is not any skinnier or sicker looking than others

What could this be due to? is it a sign of illness?

We've wormed the chooks regularly and this has happened since last worming (3months ago)

Is there anything else we should do? Would it be contagious? Should we try to somehow clean it?

 

[Chookychicky]

I would try washing it away first in a warm soak bath with soapy water, and being gentle with plying the poop apart (just gently rub the feathers between your fingers when she's had a good sit). That will get all the crusty poop off, and then just towel and air dry her (so aim for a nicer, sunnier day). Start there and see if the poop still accumulates. Any electrolytes lately? Any evidence of lice nits or eggs?