The difference between hydrafacial injection and photorejuvenation includes the main role, treatment mode, technical principle and so on. 1. Main role: Hydrafacial injection is mainly used for facial hydration, whitening, and lightening fine lines; photorejuvenation is mainly used to improve facial pigmentation, dull and uneven complexion and other skin problems. 2. Treatment: Hydrafacial injection belongs to the injection type of skin care, usually using the appropriate substances injected into the body, such as hyaluronic acid, botulinum toxin, vitamin C, etc.. Photorejuvenation belongs to physical therapy, which mainly utilizes special instruments to improve the skin. 3. Technical principle: Hydrographic needle is the use of vacuum negative pressure technology, the required substances such as hyaluronic acid into the body, to achieve whitening, moisturizing and other effects. Photorejuvenation is the use of photothermolysis, biological stimulation and other principles, so that the subcutaneous collagen regeneration, to help tighten the skin, wrinkle. The difference between hydrafacial injection and photorejuvenation is not one, it is recommended to go to a regular hospital to consult a doctor about the matter.