1.Open windows more often to ensure air circulation in the house. 2.Place a humidifier or air purifier indoors, which helps improve the air quality of the local environment indoors. 3, maintaining clean air conditioning filters and ventilation ducts is an important condition to ensure clean indoor air, air conditioners should be cleaned regularly. 4, if you buy office furniture, or move into a new home soon after the office, should prevent indoor formaldehyde exceeds the standard, you can place plants such as green plants. 5, must pay attention to a short time do not inject vaccines Vaccination is a good way to prevent diseases, but for patients with allergic purpura, it is not recommended to inject vaccines. This is because some of the allergic purpura is after the injection of vaccine onset, clinical can also see, after the injection of vaccine purpura repeated situation.