Is the hyaluronic acid injection (mesotherapy) safe?
Generally, hyaluronic acid injections (commonly known as "water light needle") are considered safe, but should be performed under a doctor's guidance. Detailed explanation is as follows:

Hyaluronic acid injection is a common aesthetic treatment. Its primary mechanism involves using micro-needles to directly inject nutrients such as hyaluronic acid, vitamin C, B-complex vitamins, amino acids, and antioxidants into the deeper layers of the skin. This procedure aims to hydrate, moisturize, brighten skin tone, improve skin texture, and promote skin metabolism. These components are relatively stable in the human body, easily absorbed, and generally do not cause severe side effects or rejection reactions, thus making the treatment relatively safe. The usual reference price for hyaluronic acid injections is 1500–3000 yuan per session, and noticeable improvement is usually observed within 5–7 days.
Prior to treatment, patients should inform their doctor about their allergy history and general health condition, so the doctor can assess whether the treatment is suitable. After receiving hyaluronic acid injections, it is important to keep the treated area clean and dry, and avoid contact with water to prevent infection. Additionally, exposure of the treated area to direct sunlight should be avoided to reduce the risk of hyperpigmentation.