The hazards of hydrafacial injection mainly include infection, allergy, affecting metabolism, local reaction, etc. The details are elaborated as follows: Water light injection is a kind of injectable skin care therapy, the cosmetic injection into the dermis layer immediately under the epidermis, so as to achieve the purpose of beauty. 1. Infection: injection of water light injection is bound to stimulate damage to the skin, damage to the skin’s natural barrier effect, causing traumatic inflammatory reaction, may lead to the injection site of the needle mouth infection. 2. Allergy: certain hydrafacial injection will cause the body to produce an allergic reaction, resulting in local skin damage, mainly manifested in the injection site of skin edema, rash, erythema and bruising. 3. Influence metabolism: the skin is difficult to fully absorb the cosmetic ingredients directly injected into the dermis, not in line with the normal physiological metabolism of human skin, can cause skin irritation, damage to the normal metabolism of the skin, resulting in transient sensitivity of the skin stage, after injection of scientific care, can be recovered on its own. 4. Local reaction: due to the impurity of the composition of the injection of hydrafacial injection, the amount of factors, may cause local capillary rupture, local stiffness, lumps, redness at the injection site aggravated by side effects. Hydrafacial injection treatment should be well assessed and carried out in regular hospitals or beauty institutions to minimize the harm.