Hyaluronic acid, scientifically known as hyaluronic acid, acts as an architect and filler in the skin while retaining and absorbing moisture. As the skin ages, the hyaluronic acid content gradually decreases, which directly leads to the loss of moisture and the formation of wrinkles. Therefore, more candidates choose to inject hyaluronic acid, the hazards of which are as follows: 1. When injected, hyaluronic acid mistakenly enters the blood vessels will cause embolism, which can result in blindness or necrosis of the nose, or even pulmonary embolism, leading to death; 2. Selection of unqualified products may result in local infection, redness, swelling, pus, and pain; 3. If the operator is inexperienced, it can lead to uneven surface and wide nose after injection. As a filler material for facial injection plastic surgery, hyaluronic acid is considered to have low rejection reaction and high safety. However, due to the lack of safety awareness of many candidates, they choose irregular and unprofessional organizations to carry out hyaluronic acid injections, resulting in the frequent occurrence of hyaluronic acid injection accidents. Therefore, beauty seekers must choose professional doctors in regular hospitals to operate, and learn to identify and use regular and legal hyaluronic acid products to ensure injection safety and effect.