Red and blue light acne treatment is usually done once every 2-4 days, and a course of treatment takes about 4-8 times. Red and blue light is a treatment that uses a narrow-spectrum light source to emit cold light, converting light energy into intracellular energy. The combination of red and blue light helps to kill Propionibacterium acnes, clear inflammatory and cystic acne, and act on scar tissue to induce cellular secretion for collagen production. Before the operation, pay attention to continuous sun protection, eat less greasy and spicy food, and keep a happy mood. 3-4 days after the operation, try to wash your face with non-irritating cleansing products, keep the affected area clean and fresh, do not use cosmetics, and apply the restorative ointment prescribed by the doctor and take anti-inflammatory drugs and antibiotics orally. After 7 days, the wound will start to scab off. At this time, you should pay attention to sun protection and apply sunscreen when you go out, at least for 3-6 months. Any abnormal conditions need to seek medical attention in a timely manner, do not take matters into your own hands to solve.