The skin manifestation of allergic purpura is mainly a red rash on both lower limbs or buttocks. The rash has certain distribution characteristics, firstly it is manifested on the buttocks and both lower extremities, bilaterally symmetrical. The rash is brighter in color, does not fade when pressed, and can be slightly elevated in plane. In addition to the lower extremities, some children may have a small rash on the upper extremities or face, and relatively few have a rash on the trunk. Some children with severe symptoms may have blisters or ulcers, or a necrotic rash, so the rash is relatively characteristic. There are also some skin can appear edema, called angioneurotic edema, can appear on the scalp, waist or legs, appear morning water, for example, wake up in the morning to find the scalp swollen, are related to allergic purpura. The actual fact is that you can find a lot of people who have been in the business for a long time, and that is why it is so important for you to have a great deal of time.