Does anyone know what this is. Please.

[Chris012]

 

[Eggcessive]

I think it could possibly be dry fowl pox, a virus spread by mosquitoes that has no treatment. The other possibility might be favus, a fungus. It is treated with miconazole or Lotrimin, but use rubber gloves since fungi can be spread to you and other chickens. Here are some links to read: https://www.backyardchickens.com/a/avian-pox-how-to-treat-your-chickens-for-avian-pox
https://www.backyardchickens.com/t/...ave-favus-or-fowl-pox-need-help-for-treatment
https://www.backyardchickens.com/t/...wattles-overtaken-by-white-growth-please-help

 

[R.M.Qureshi]

Looks like a start of Fowl pox. Treat with variolinum 30 (Homeopathic medicine) 8 drops per 100 ml in drinking water till cure.

Regards
RM