Cat scratching bulge is a common phenomenon, mostly due to capillary damage, but if the patient appears other accompanying symptoms such as itching, fever, breakage, pus, etc., consider it may be allergy, infection, contact dermatitis, cat scratch disease, etc.: 1, capillary damage: usually there are more capillaries under the skin of the human body, after being scratched by the cat resulting in capillary rupture, the patient can appear local bulge phenomenon; 2, allergy: if the patient Allergy: If the patient is scratched by a cat, there is a bulge and accompanied by itching symptoms, considered allergic; 3, infection: because the cat’s claw is not a clean object, when the human body is scratched by a cat, local infection phenomenon, there can be bulging, pain, skin temperature, etc.; 4, contact dermatitis: contact dermatitis refers to the skin, mucous membrane single or repeated exposure to animal, chemical and plant-based substances cause acute or chronic inflammation of the skin local Reaction. Cat scratching is an animal factor, the patient can appear bulging phenomenon; 5, cat scratching disease: when the human body is cat scratching, bite Hansenbach’s body invaded the human body, the patient can appear one to several local erythematous papules, a few papules can turn into blisters or pustules. Most patients have symptoms such as fever, fatigue, and anorexia. When a patient is scratched by a cat and a bulge appears, the wound needs to be disinfected and treated as soon as possible. The doctor will judge the treatment on a case-by-case basis, and also determine whether rabies vaccination, tetanus vaccination, etc. are required.