Allergic purpura can be mild or severe, the prognosis of the disease is determined by its clinical typing, roughly as follows: 1, simple skin type allergic purpura: other organs are usually not damaged, the prognosis is generally good; 2, abdominal type allergic purpura: the condition may be accompanied by obvious abdominal pain, or even gastrointestinal bleeding, individual serious cases can also have life-threatening conditions; 3, renal purpura: there may be kidney damage, usually there will be urinary routine of urine occult blood, urine protein positive performance, if the treatment is not timely or not standardized, there is a long-term kidney damage may develop into purpura nephritis or uremic syndrome; 4, arthritic allergic purpura: usually can be relieved after symptomatic treatment; clinically many allergic purpura belong to mixed type, and each person’s performance is different. If the onset of allergic purpura is accompanied by abdominal type and renal type at the same time, you need to pay special attention to the standardized drug treatment under the guidance of clinicians and do regular urine routine and other tests to avoid adverse consequences due to untimely treatment.