The early stage of purpura is the appearance of symptoms on the skin, the skin will appear brownish red macules, the surface is more prominent, either alone or in patches, and will be itchy, painful and recurrent. In addition, it can lead to kidney lesions, and the early appearance of hematuria can lead to nephrotic syndrome, accompanied by mild proteinuria. Sometimes some people also experience painful arthritis with swelling around the joints, especially at the knee. Abdominal pain and even nausea, vomiting, diarrhea, and blood in the stool may occur in some people. In addition, some people may also develop scrotal edema, lung damage, central nervous system disorders such as dizziness, drowsiness, nausea, vomiting, etc. If the above early symptoms are found, patients are advised to go to the hospital for examination in a timely manner.