Almost everyone has had “acne” in their lives, and many adolescents in particular have suffered from “acne” in their faces. “Acne, medically known as “acne”, is a skin disease with a high incidence. It is common among young men and women between the ages of 13 and 30 and occurs mainly on the face, followed by the chest, back and shoulders. It starts as whiteheads and/or blackheads and can gradually develop into inflammatory papules, pustules, nodules, cysts and abscesses. If left untreated or improperly treated, acne often leaves behind pigmented spots (acne marks) or even atrophic scarring (acne pits) after the inflammation subsides, which not only seriously affects aesthetics but also causes great damage to one’s mental health. The causes of acne are multifaceted and are mainly related to androgens, increased sebum production, hyperkeratosis of the epithelium at the mouth of the hair follicle, Propionibacterium acnes infection and genetics. The development of the sebaceous glands is governed by androgens. The increase in androgen production during puberty causes the sebaceous glands to enlarge and sebum secretion to increase, forming an acne pathogenesis centered on increased sebum, blocked sebum drainage and bacterial infection. In addition, personal hygiene, irregular lifestyle, mental stress, lack of sleep, irregular menstruation, pregnancy, improper skin cleansing, excessive and frequent use of soaps and cosmetics or even poor quality cosmetics, as well as long-term use of tuberculosis pills, birth control pills, drugs containing bromine, iodine and steroid hormones may trigger or aggravate acne. There are many treatment options for acne and the treatment period is long. The earlier the treatment, the better the results. In general, mild acne will improve within a few weeks, moderate acne will take 1-3 months, and severe acne will take 4-6 months. Acne that has improved with treatment may inevitably recur, so it is important to pay attention to this and have another course of treatment as soon as possible. For inflammatory acne, depending on the severity of the inflammation, the traditional treatment plan is based on local topical and/or oral medication, generally oral antibiotics, retinoids and Chinese herbal medicines to clear heat and detoxify the body, sometimes supplemented by physical therapy such as facial inversion, acne picking and red and blue light irradiation, etc. Traditional treatment methods are slow to work, have more contraindications, and have many shortcomings. Local medication may cause contact allergy or irritation such as erythema, flaking, burning pain, etc. Long-term continuous oral medication has many side effects and is also easy to cause drug resistance. For the stubborn pigmentation spots, capillary dilation, superficial scarring, atrophic scarring and even hypertrophic scarring that remain after the inflammation of acne subsides, the traditional treatment methods are helpless and ineffective. However, with the rapid progress of medical technology, in recent years, the application of advanced photon technology for the treatment of various types of acne has the unique advantages of quick results, short treatment course and no obvious side effects, which can effectively shorten the course of the disease and reduce or even eliminate the need for oral medication, opening up a new way for the treatment of acne. Photons, also known as intense pulsed light, are targeted according to the different types and stages of acne, and different photons are selected for individualized treatment, which often leads to quick and relatively satisfactory results. For inflammatory acne, intense pulsed light (photon) in the wavelength range of 405nm-420nm is generally chosen. This is a high-intensity blue-violet light, which is the most effective light for destroying Propionibacterium acnes. It is especially suitable for mild and severe inflammatory acne and persistent acne. Every patient wants to get the best results in the shortest possible time, but also wants to make the treatment process extraordinarily easy, and 420nm light can easily help you achieve this. Inflammatory acne can generally be completely controlled and recede after a period of active and comprehensive treatment. However, because many patients do not pay enough attention at the beginning of the disease and do not treat it properly or squeeze it hard enough, the inflammation deepens and worsens, destroying the deeper skin tissue. Acne scars are a permanent pain in the heart of many acne sufferers. Mild acne marks and very superficial acne scars will disappear naturally or repair on their own over time, and the use of fruit acid peels, L-vitamin C introduction, Q1064 laser or intense pulsed light (photon) treatment can accelerate the fading of discoloration. Atrophic (depressed) scars, however, cannot be completely reversed once they are produced and will not disappear automatically, and must be treated with CO2 laser grinding combined with anti-scar medication, intense pulsed light and/or fractional laser. Among them, intense pulsed light (photon) adopts the principle of selective pyrolysis and photochemistry, by emitting photons with a wavelength range of 515-1200nm, it can not only lighten acne marks and smooth acne scars at the same time, but also improve a series of problems such as other facial blemishes, enlarged pores and dull complexion caused by sun damage and photoaging at the same time, thus enhancing skin quality in a comprehensive manner and achieving The purpose of “photorejuvenation”. In conclusion, acne has a complex etiology, a high incidence, a tricky treatment, and is also prone to recurrence, so how to effectively prevent and care for it is especially important: ① Diet should be low sugar, low fat, light and easily digestible food. Eat more foods rich in vitamins A, B2 and B6, and rich in zinc. Eat more fresh vegetables and fruits that can make body fluids alkaline, eat less high-fat, high-sugar and spicy stimulating foods, and stop smoking and drinking. It is best to stop using all cosmetics or creams, and no more “acne” cosmetics. If you have to wear makeup, it is best to wear light makeup, and do not use oily and powdered cosmetics and maintenance products, do not use glucocorticoid preparations, remove makeup as soon as possible after work, and the best interval between the use of topical acne medication and cosmetics is about half an hour. ③ Wash your face in the morning and evening to keep it clean. Use warm water and a non-irritating cleanser to wash the affected area. ④ It is best not to squeeze acne on your own to avoid triggering or even aggravating infection, leading to discoloration and scar formation. Blackheads and septic pimples are best treated by a health care professional under sterilization. ⑤Regulate your emotions, maintain a regular lifestyle, ensure sleep, keep your bowels open and avoid strain.