Henoch purpura is a common vasovagal allergic reaction disease, usually need to cooperate with the doctor to do general examination, blood and urine routine examination, immunological examination, imaging examination, endoscopy, pathology examination, etc. according to the specific situation. 1. General examination: the doctor can observe the pattern and distribution of the rash, determine whether there are symptoms of edema, and clarify whether the joints, digestive tract and kidneys are involved. 2. Blood and urine routine examination: blood cell count can help the doctor to determine whether there is infection initially, and urine routine can help the doctor to determine whether the lesion invades the kidneys, which can help the diagnosis and treatment of Henoch-Schwarzenegger’s purpura. 3. Immunological examination: some patients with purpura may have elevated serum immunoglobulin, which helps in the diagnosis of the disease. 4. Imaging examination: Through ultrasound, X-ray and CT imaging examinations, it can be clarified whether there is any damage to the digestive tract and gastrointestinal tract in allergic purpura. 5. Endoscopy: Through endoscopy of the digestive tract in patients with allergic purpura, changes in the digestive tract of patients with purpura, such as erosion and ulceration, can be directly observed. 6. Pathologic examination: For patients with atypical or suspected skin purpura, skin biopsy can be performed to assist in the diagnosis. Allergic purpura patients need to go to the hospital in a timely manner, under the guidance of the doctor according to the individual situation to do the relevant examination, so as to carry out targeted treatment or treatment.