Henochromic purpura cannot be cured completely, and most patients who take timely steps to treat it will be in remission after 2 weeks to 6 months. Henoch-Schönlein purpura cannot be cured completely, and most patients may experience a relapse. The course of the disease is usually 2 weeks. If the patient develops purpura simplex, the purpura usually disappears after two weeks of treatment and the symptoms gradually improve. As the disease worsens, the treatment time may be extended. If a patient develops renal purpura, treatment is usually required for 3 to 6 months for relief. Although purpura cannot be cured completely, patients can take timely measures to improve their symptoms. It is recommended that patients need to consult a doctor in time to check the allergens, and need to reduce the contact with allergens after clarifying the allergens. In addition, patients need to rest more, diet can eat food rich in vitamin C. It is recommended that patients with allergic purpura consult a doctor in a timely manner to avoid delaying their condition.