The clinical manifestations of recurrent allergic purpura primarily include purpuric rashes on the lower limbs. If the patient experiences joint pain, it is also a clinical symptom of recurrent allergic purpura. Some severe cases of allergic purpura may even present with abdominal pain and other gastrointestinal symptoms. Additionally, some patients may exhibit significant amounts of protein in the urine and impaired creatinine levels. This indicates allergic purpura with purpuric nephritis, which is considered severe in the context of allergic purpura. Therefore, if a patient presents with the aforementioned symptoms, the recurrence of allergic purpura should be considered. At this point, further examinations such as blood tests, urine tests, and kidney function tests can be conducted to assess the condition.