What causes allergic vasculitis to become negative?

There are two main causes of allergic noninfectious vasculitis: first, prolonged exposure of the skin to cold and damp environments, which leads to cold stimulation of blood vessels and triggers allergic vasculitis; second, long-term contact with harmful substances such as medications, chemicals, or certain foods, which stimulate the body's immune system and result in allergic reactions. Treatment for allergic noninfectious vasculitis typically involves a combination of medication and physical therapy. Medication mainly includes oral antiallergic drugs, antibiotics, and anti-inflammatory agents. Physical therapies may include ultraviolet radiation, sauna baths, or steam therapy. Among these, ultraviolet irradiation has shown relatively good clinical efficacy, helping to eliminate and alleviate symptoms of allergic noninfectious vasculitis. Additionally, patients should pay attention to keeping warm, maintain regular sleep habits, and increase nutritional intake to promote recovery and improve their condition.