Knemidocoptes mutans, commonly known as the scaly-leg mite, causes disease in various avian species. In a peep of bantam chickens, proliferative skin lesions were observed on the shanks of 6 of 29 birds, with digit necrosis observed in some birds. Histologic examination of the necrotic digits revealed Knemidocoptes species in the stratum corneum. No new cases of scaly-leg mite infection occurred in the flock after administration of ivermectin, and treatment halted the progression of the disease process in infected chickens. This case report documents that severe Knemidocoptes infection can be associated with digit necrosis in chickens.