In fact, the hydration injection according to the course of injection or in accordance with the frequency of the doctor, and then repeat the treatment according to the condition of the skin under the advice of the doctor, nothing side effects. The so-called side effects, is the injection may produce pain, especially the composition of the addition of vitamin C products, you can use a little local anesthetic cream beforehand, but the local anesthetic cream affect the effect. The injection site with needle hydrophoresis is more accurate, the dose is more accurate, there is no leakage or consumption of the drug. Needle-free hydrafacial, because of the effect of air pressure, there will be a part of the omission or depletion. But it is painless and more uniform. However, injecting Botox requires more accurate loci. Can it be used for a long time? Yes, as a supplemental moisture, if simply injecting hyaluronic acid, it can be used as a long-term maintenance means to get rid of pigmentation if the efficacy of the treatment is seen can go to the ingredients, moisture can be. Some patients popped acne after doing it because there are bacteria on the surface of the skin, the cleaning process is not clean, especially needle-free hydrophoresis, to clean the skin folds and creases within the stratum corneum, mainly bacteria, and then inject drugs to reduce bacterial infection. Although asepsis is done well and sterilization is done beforehand, there are patients who have breakouts and generally have needles that may irritate the sebaceous glands and overproduce sebaceous glands. However, the dermatologist can completely solve it.