In the medical field, hyaluronic acid, commonly known as hyaluronic acid, is a naturally occurring substance in the human body that plays an important physiological function in the body, such as water retention, lubrication, and promotion of repair. However, with ageing and aging, hyaluronic acid starts to be lost at an accelerated rate after the age of 20. The majority of beauty seekers began to use hyaluronic acid for skin care, but because hyaluronic acid skin care products are not injected into the skin, so the side effects are small. Nowadays, there are a lot of unorthodox skincare products on the market that claim to have added hyaluronic acid ingredients. After choosing and using these irregular products, some candidates may experience skin problems such as allergy, redness, redness and swelling of the skin. Therefore, beauty seekers need to choose regular products to use, but in order to prevent allergies, in the wrist, behind the ear and other sensitive areas, take a small amount of the product for test coating, if there is no allergic reaction, before continuing to use. Hyaluronic acid in skin care products can only work on the epidermis, it is difficult to penetrate deep into the skin, so in the field of medical aesthetics, only the real hyaluronic acid injected into the skin, can really play its role. Candidates who have the need for hydration can go to a regular institution for hydration injections to get good cosmetic results.