Rolling needle and hydrazine needle are commonly used in clinical medical aesthetic projects, both have the effect of fading wrinkles and other effects, but the principle of action and the operation method of the two are different. 1. Operation method: rolling needle is arranged in the roller above the dense tiny short needle, when rolling on the skin surface, these needles can enter the dermis layer of the skin, so as to play a therapeutic effect. Hyaluronic acid is injected into the dermis by injection. 2. Principle of action: rolling needle is the use of needles on the skin caused by the small damage can be healed naturally, and the healing process of the skin’s collagen, hyaluronic acid and other substances will be produced to play a role in repairing the skin. Hydrographic injection through the hyaluronic acid and other substances injected directly into the dermis to improve the state of the skin. It is recommended that patients go to a regular medical institution to choose a suitable treatment plan under the guidance of a professional doctor.