Pyoderma refers to a skin disease that is pyogenic. These include superficial bacterial infections such as impetigo, impetigo contagiosa, ecthyma, folliculitis, Bockhart's impetigo, furuncle, carbuncle, tropical ulcer, etc. Autoimmune conditions include pyoderma gangrenosum.
There is an increased risk of infection when a dog's skin is cut or wounded. Lesions and pustules, and in some cases partial hair loss, are characteristic symptoms. Other symptoms would include itchiness, crusted skin, Dried discharge in affected area. The infection could be superficial or deep.