Cat skin diseases are generally divided into four categories. One is fungal skin diseases, the most typical of which is cat ringworm, which is mainly caused by local hair loss, itching and other symptoms caused by fungal infection, and is generally distributed in a circular shape. The second is parasitic skin diseases, which are mostly bite infections caused by mites, fleas, etc., and will cause relatively scattered symptoms of redness, swelling, and dandruff. The third is allergic skin disease, which is usually caused by allergens such as dust and pollen. The most obvious symptom is itching, which has a certain seasonality. The fourth is bacterial skin disease, which usually causes suppuration and even ulceration in severe cases, but there is no obvious itching.