Good Day. Writing from Devon, England. Two months back took over two laying hens from family who could not keep them. They came with house. Have them in large outdoor run in garden. One, called Dorcus, has, in past seven days lost very many feathers, bare patches of skin visible. When they arrived steamed cleaned house, and sprayed with anti red mite. Anti-mite carried out weekly. No infestation seen in hose or on birds. Other bir seems perfectly healthy. Very little knowledge of chickens. Last kept them as food during 2nd world War in London. Would very much advice and information from other who have knowledge of problem. Best wishes from across The Pond. Len Spellman.