The precautions for hyaluronic acid filler include paying attention to local care, diet, anti-infection treatment and sun protection. 1. Local care: usually after hyaluronic acid injection, the local needle hole will be closed after 24 hours, so during this period, no water, make-up within 24 hours. Local swelling, pain, bruising and other adverse reactions may occur, it is recommended that patients follow the instructions of the local ice packs after hyaluronic acid injection to relieve the symptoms. 2. Dietary adjustments: after hyaluronic acid injection, diet should not eat foods that are easy to trigger allergies, such as peanuts, mango, milk, animal protein, seafood, etc., and less spicy and stimulating foods. 3. Anti-infection treatment: after the injection of hyaluronic acid, according to their own situation, such as local secondary infection, need to use antibiotic treatment in a timely manner under the guidance of a specialist. 4. Good sun protection: after hyaluronic acid injection, go out and do sun protection, avoid direct exposure to ultraviolet rays, so as not to produce pigmentation. Generally after the injection of hyaluronic acid, there will be corresponding medical advice, it is recommended that patients strictly comply with medical advice, scientific care.