Hydrafacial is a treatment that involves injecting a single molecule of sodium hyaluronate or other medication directly into the dermis through a negative pressure hydrafacial device. The process is divided into three steps: cleansing, surface anesthesia, and injection. The main ingredient of hydrafacial injection is small molecule hyaluronic acid, which can make the skin more hydrated and tender, and play the role of water retention and moisturizing. At the same time, hydrafacial injection can be added with many other ingredients on the basis of small molecule hyaluronic acid, so as to achieve different effects, for example, add VC to whiten; add placenta can be antioxidant; add botulinum toxin to have part of the wrinkle removal function. There are 3 main steps for hydrafacial injection as follows. Cleansing, before the hydrafacial injection, the face should be thoroughly cleaned to spread the pores and remove some excess oil and dust on the skin surface. Surface anesthesia, because the hydrafacial injection is with a machine, with a very fine needle into the skin, there will also be some stinging sensation, so it is best to use local anesthesia medication on the skin, anesthesia can be completed in about half an hour. Injection, injection using a special machine, usually nine rows of needles directly into the subcutaneous injection of hydrafacial injection drug ingredients, which will slowly release the drug, accurately injected into the appropriate level. It is not advisable for patients with allergies and scarring. Risks such as pain, hyperpigmentation, rashes, and infections may occur after hydrafacial injection. Patients are advised to go to regular medical institutions for injections to avoid adverse consequences.