First and foremost, allergic purpura refers to a hemorrhagic disease that affects the capillaries in the skin or other organs; it is categorized as a rheumatic immune disease. It primarily occurs in adolescents and children aged between five to fourteen years, and cannot be cured. The disease is prone to recurring, which is its main clinical characteristic. The primary causes are infections, drugs, or food allergies, with infections being the most significant factor. Therefore, upon the appearance of skin purpura or bleeding spots, joint swelling, or signs such as hematuria and proteinuria, timely and comprehensive examinations should be conducted for diagnosis. Once the kidneys are involved, it is essential to rest in bed until the proteinuria alleviates. Moreover, it is crucial to conduct a 24-hour urinary protein quantification to assess the extent of kidney damage. If there is a significant amount of proteinuria, it is advisable to promptly perform a renal biopsy to clarify the type of pathology.