I Think I Have A Sick Hen- Pale and Droopy Comb

[273816]

When I went to check on the chickens this morning, I noticed Eden's comb was pale and droopy. She'd just finished laying an egg and the egg was perfectly fine.
She's running around chasing bugs, she's eating normally and drinking normally, everything she usually does is fine.
My other chickens-Beyonce, Elsa and Beatrice- aren't showing any signs of a pale or droopy comb.

Any help would be much appreciated,
Rachel.

 

[Eggcessive]

I would make sure that she has not mites on her, and I would recommend worming her with a good broad spectrum wormer that gets more than roundworm. Look at her stools to make sure there is no blood in them. Avitrol and Wormout gel are both very good. Here is a link: http://planetpoultry.com.au/15-medications