Itchy skin that breaks out when scratched requires attention to whether this pack will subside. As a dermatologist, if you encounter a pack that breaks out when scratched, you should first suspect artificial urticaria. If the packet can subside within an hour or a day, attention should be paid to whether the patient has been exposed to any special items recently. Because in patients with artificial urticaria, clinicians will ask patients in the clinic if they have recently taken medication, moved, bought new furniture, renovated, etc. After these cases are completely ruled out, then autoimmune conditions are considered, that is, their own allergies.