Ear hyaluronic acid injection is a kind of cosmetic plastic surgery, which fills the concave part of auricle by injecting hyaluronic acid to improve the ear shape and appearance. Injected hyaluronic acid will be gradually absorbed in the human body, so its effect is not permanent. According to individual differences and injection techniques, the effect of intra-ear injection of hyaluronic acid usually lasts for 6 months to 1 year. As time goes by, the injected hyaluronic acid will be gradually metabolized by the body, and the depression of the auricle will reappear. If you want to maintain the effect, you need to inject regularly or consider other long-term plastic surgery methods. Consult a professional doctor for more detailed advice and information.