What are the side effects of hyaluronic acid injections?

The side effects of hyaluronic acid injections mainly include: 1. Local reactions: redness, swelling, pain, or itching at the injection site may occur, which are usually temporary. 2. Allergic reactions: some individuals may develop an allergic reaction to hyaluronic acid, manifesting as rashes, difficulty breathing, etc. 3. Vascular embolism: if hyaluronic acid is accidentally injected into a blood vessel during the procedure, it may cause vascular occlusion, potentially leading to blindness or stroke in severe cases. 4. Over-injection: excessive injection may result in skin irregularities, affecting aesthetic appearance. Please note that before receiving hyaluronic acid injections, you should fully understand the potential risks and choose a qualified medical institution for the procedure.