The number of times you can do microneedling to fill in acne pits depends on the severity of the pits, the patient’s skin type, etc., and cannot be generalized. Micro-needling is mainly used to stimulate the skin by using many tiny needles on its roller to promote the renewal of fibroblasts and the rearrangement of collagen fibers to remove acne pits. If the acne pits are not very serious and are recently formed, it may be possible to do 1 micro-needling treatment to effectively get rid of acne pits, but if the pits are more serious and persist for a longer period of time, it may take 3-5 treatments to fill in the pits. Therefore, if acne pits are a problem, you can consider micro-needling, but be sure to choose the dermatology department of a regular hospital and perform it under the guidance of a professional doctor. After performing microneedling treatment, local contact with water is prohibited for about 8-72 hours, all functional cosmetics are forbidden, and attention should be paid to sun protection, dust prevention and anti-irritation. After microneedling treatment, facial skin may appear tingling, mild edema and peeling, if there is significant discomfort, it is recommended to return to the dermatology department for a follow-up consultation in a timely manner.