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Poultry worms do not have dark line down the center. Here's a photo of a maggot. I believe you are dealing with Fly Strike, not worms. Please see post #2 in this link for treatment: https://www.backyardchickens.com/threads/hens-have-worms.1593213/#post-27074039

Please post a photo of the worms. However, I suspect you're dealing with maggots. It's called "Fly Strike."