(Dried) pus or blood on the skin of a cat or dog are consider skin lesions, and are characterized by an abnormal appearance or growth. These conditions are quite common in pets and can occur in both cats and dogs. Some of the most common causes of skin lesions include allergies, fungal infections and flea or tick infestation. However, some other things that can cause skin lesions in cats and dogs are dermatitis, pyoderma, abscesses, cysts, skin cancer and liver disease.
Skin Lesions Affects