Allergic purpura is a common disease of the blood system, with bleeding as the main clinical manifestation; some patients also have joint pain, abdominal pain; in addition, there are urinary routine appear occult blood and protein. The actual fact is that you can find a lot of people who are not aware of the results of the disease and often panic, here are some common sense: 1, there are certain reasons for this disease, such as a cold or eating food that causes allergies and so on. Bacterial or viral infections can both trigger and aggravate the disease; and seafood or other protein-based foods in the diet are also triggering and aggravating factors. The disease is divided into five categories: skin type, joint type, abdominal type, kidney type and mixed type; 3. It is not necessary to be nervous at this time, but it is more important to analyze and find the things that cause allergy and avoid contact with them. The actual fact is that you can find a lot of people who are not able to get the best out of your own home. Even if the purpura disappears and the urine occult blood is negative, you still need a phase of consolidation treatment.