Allergic purpura commonly occurs in adolescents and children, characterized by frequent relapses and being intractable. It is primarily seen in youth aged between 5 to 14 years. As they age and their immunity strengthens, the frequency of episodes gradually decreases. The most common causes of allergic purpura include infections such as bacteria, viruses, parasites, mycoplasma infections, and allergies to medications and foods, with food allergies mainly stemming from high-protein foods like fish and shrimp, which can easily trigger allergic reactions. Therefore, once skin purpura or proteinuria appears, it is crucial to rest in bed until the pain and proteinuria dissipate and the purpura eases. During treatment, it is also important to avoid cold exposure and overexertion.