Wet looking neck in BO?

[ceeceeholt]

I have a 16 week BO and 2 days ago she had what looked like a "wet" or "oily" looking neck. At first I thought she just got wet from the dew, but then it never dried. She is acting normal, eatting, drinking, good poops. Eyes look a little watery, but not too bad. Beak looks normal. Took her out of the pen/coop, but I have searched all over and can't find anything about this. Any help would be great.
She is eatting layer crumbles, scratch, oyster shells, bugs etc!
Thank you all.

 

[ChickensAreSweet]

https://www.backyardchickens.com/forum/viewtopic.php?pid=4764751
Could the drainage could be coming from the facial area? This thread mentions when they tuck their heads in to sleep, etc.