One chicken’s leg is green?

[Mellthatcher]

Update.
She has grown up well. I’ve never seen any health issues or anything. The leg just looks really funky and is some concern to me. I really hope there is nothing wrong with her. It’s just really, really odd to me that she has one leg like this.
Has anyone ever seen this before in a chicken? Should I be concerned?

 

[NewBoots]

It looks like those weird genetic anomalies you get when a creature originally was going to be 2 then one gets absorbed into the other. Chimera I think they're called.