The principle of action of hydrafacial injection is mainly to use negative pressure to inject hyaluronic acid, botulinum toxin and other injections into the superficial dermis to improve skin texture. Hydrafacial injection is to inject hyaluronic acid, botulinum toxin, vitamin C and other injections into the superficial dermis through micro-needle by negative pressure, which can achieve replenishment of water, and improve skin texture, brighten skin tone, shrink pores and tighten skin. However, good care is needed after treatment, including strict sun protection, hydration and moisturizing. If localized redness and swelling occurs, ice packs can also be taken to relieve swelling. In addition, after the injection of hydrafacial injection should be prohibited from smoking and alcohol, avoid strenuous exercise, and take more rest. If you need to improve the skin condition through the water light injection, you need to go to the regular hospital to consult the doctor and cooperate with the doctor to regulate the treatment.