Whether patients with allergic purpura need to be hospitalized mainly depends on the severity of their condition. For mild cases of allergic purpura, also known as purely dermal allergic purpura, where the main clinical manifestation is a rash primarily on the lower limbs, outpatient treatment is sufficient. However, if the patient has gastrointestinal or renal types of allergic purpura, hospitalization is required. The gastrointestinal type of allergic purpura involves significant symptoms such as abdominal pain and diarrhea, while the renal type is characterized by symptoms like edema and significant proteinuria. If allergic purpura affects internal organs, the digestive tract, or kidneys, hospital treatment is necessary.