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Swollen wrinkled yellow skin on patch on neck

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My hybrid Sarah is moulting but otherwise behaving normally. Yesterday I noticed a bare patch on the back of her neck where the skin is swollen, yellow and wrinkly. The vet is mystified and suggests a week on antibiotics followed by a biopsy if it doesn't improve. Anyone any ideas please?

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It could be the activity of 'depluming mites' Egghead? They eat into the quills to suck the blood out at the base and invariably the feather snaps off. They are solitary creatures apparently and I have never seen one or researched much about them. We have had such as you on necks of several hens in the past. Each was treated with a single spray of Frontline from the vet (0.5mL and not licensed for chickens) and the feathers grew back. In your case there may be some inflammation under the skin, but that's what I would try. You must avoid any spray in the eyes so it might be best applied with a cotton bud.

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I think the most likely possibilities are:


1. An infection (especially as she is moulting and, unfortunately, we have rats):


(A) pasteurellosis (fowl cholera) http://www.thepoultrysite.com/diseaseinfo/61/fowl-cholera-pasteurellosis


(B) erysipelas http://www.thepoultrysite.com/diseaseinfo/56/erysipelas


© fowl pox (doesn't look like it)


(D) Marek's disease http://www.merckmanuals.com/vet/poultry/neoplasms/mareks_disease_in_poultry.html?qt=Marek's%20disease&alt=sh


Another bacterial, fungal, viral or protozoan infection.


2. Parasites - depluming mites, other parasites (but she is not scratching)


Other possibilities are trauma, a tumour, liver problems, poisoning, an allergy.

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