Leukocytes are elevated in routine blood tests during episodes of allergic purpura. The causes and treatments are explained below. 1. Causes: Anaphylactoid purpura is a vasculitis disease with an unknown etiology, but most cases are preceded by a history of upper respiratory tract infection. Among them, alpha group hemolytic streptococcal infection is an important factor leading to purpura, so this disease can cause an increase in white blood cell count, and the higher the white blood cell count, often suggesting that the disease is more serious. 2. Treatment: The causative factors should be removed, such as the prevention and treatment of upper respiratory tract infections (levofloxacin), and avoiding the intake of potentially sensitizing drugs or foods. When urticaria or angioneurotic edema occurs, antihistamines (e.g. chlorpheniramine maleate) and intravenous calcium can be used; cimetidine can be used with gastrointestinal bleeding, and methylprednisolone can be used in the treatment of severe nephropathy. The person with allergic purpura should avoid re-exposure to allergens, usually pay attention to strengthening the body to reduce colds, and should receive standardized treatment under the guidance of a doctor when an attack occurs. The above drugs should be used under the guidance of a doctor.