The main principle of needle rolling is to stimulate the skin through micro-needles to increase cell activity, speed up metabolism, and improve the skin’s self-healing ability. The side effects and hazards of needle rolling are mainly redness, swelling, allergy and scarring. 1. Redness and swelling: Due to the stimulation of the skin caused by the rolling needle, it can cause redness and swelling of the skin. 2. Allergy: Roller needling requires local anesthetic before operation, a small number of patients may be allergic to anesthetic, resulting in rashes, itching and other symptoms. 3. Scars: Roller needling will cause damage to the skin, if the late care is not appropriate, it is easy to cause infection and pus, and even scars, and some patients will also cause hyperpigmentation. If the above symptoms or symptoms aggravated, patients should pay attention to the need to go to the regular hospital in a timely manner, do not be negligent, in order to avoid delaying the condition. Therefore, before, during and after the operation, we need to operate strictly according to the requirements to minimize the side effects and harm.