Acne is a chronic inflammatory skin disease of the sebaceous glands of the hair follicles, mostly on the face and upper chest and back where the sebaceous glands are particularly abundant. Many people think that acne is a normal developmental phenomenon during adolescence and that it can heal itself after this stage or after marriage, so it does not matter if it is not treated. Therefore, the prevention and treatment of acne should be given high priority in order to avoid lifelong regrets. For many people, having acne may take a few months to a few years, but once acne scars are left behind it may be a lifetime event. Acne scars are not painful or itchy and do not affect the physical health of the face. Many people may have low self-esteem because of acne scars, and many people may lose the freedom to choose their job and marriage. Needless to say, the impact of acne scars on a person is really very, very huge. Once acne scarring has occurred, how should it be properly treated? For the treatment of acne depression scars, there are currently fractional lasers, microdermabrasion and photorejuvenation. Traditional mechanical grinding, although effective, has been used less frequently due to the large trauma, long recovery period and unacceptable post-operative pigmentation. Fractional laser, a minimally invasive laser, can penetrate directly into the dermis by emitting hair-thin, matrix-arranged lasers that instantly vaporize the scarred tissue and send out a strong signal for collagen synthesis, which in turn initiates a series of skin reactions such as tissue repair and collagen rearrangement. Thus, the treatment effect is achieved. This method does not bleed after treatment and has a faster recovery, so it is now used more than traditional grinding. High-energy pulsed CO2 fractional laser is now commonly used. Microdermabrasion is performed by spraying fine sterile particles onto the surface of the treatment area to loosen and shed aging skin keratinocytes, while promoting tissue development and collagen production by stimulating the skin, promoting oxygen absorption and blood circulation in its growth layer thus reducing the symptoms of depressed scars. Photorejuvenation treatment stimulates the proliferation of skin fibroblasts through intense pulsed light irradiation, resulting in the reconstruction of dermal collagen structure, thus making the scars a little lighter. Post-acne hyperplastic scars are generally treated by local injection of corticosteroids such as Depo-Provera or Tretinoin Hydrochloride injection, or in combination with surgical excision and radiation therapy.