The reasons that may cause this state are as follows: 1. The cat does not like the unfamiliar smell on the cat, and it wants to replace it with its own smell by licking it; 2. The cat is frightened and causes skin irritation after eating food. Allergies, the presence of parasites inside and outside the cat’s body, and body itching; 3. Psoriasis and fungal infections occur on the cat’s skin. Breeders can look at the cat's body from these three aspects and then prevent and treat it.