The skin on the back of the neck is very bumpy. Sometimes that can be similar to the skin form of Mareks disease. Look at pictures 4 though 8 of the "gross lesions" section of this link which are pics of skin Mareks (pics are graphic):
http://partnersah.vet.cornell.edu/avian-atlas/#/disease/Marek's_Disease
Mareks disease can cause a lack of immunity to many common illnesses. It may cause paralysis in a leg or wing from nerve tumors, skin lesions, organ tumors, or eye changes. Hopefully, that is not her problem, but just wanted to mention it. This article has a lot of info if you would like to take time to read it:
https://www.backyardchickens.com/articles/the-great-big-giant-mareks-disease-faq.66077/
http://partnersah.vet.cornell.edu/avian-atlas/#/disease/Marek's_Disease
Mareks disease can cause a lack of immunity to many common illnesses. It may cause paralysis in a leg or wing from nerve tumors, skin lesions, organ tumors, or eye changes. Hopefully, that is not her problem, but just wanted to mention it. This article has a lot of info if you would like to take time to read it:
https://www.backyardchickens.com/articles/the-great-big-giant-mareks-disease-faq.66077/
