Acne, also known as pimples, is the most common skin disease during adolescence, with a peak occurrence between the ages of 10-17 for women and 14-19 for men. According to statistics, more than 90% of people have suffered from acne to varying degrees. It occurs in areas with abundant sebaceous glands, such as the face and chest and back. After the age of 30 or 40, the annoying “acne” appears on the face and is called “adult acne”. The causes of acne are mainly related to: (1) hormonal disorders; (2) sebum secretion and decomposition; (3) keratinization of the epidermal cells of the follicular pores and closure of the follicular pores; and (4) anaerobic bacterial growth causing purulent inflammation. Therefore, the treatment of acne should be directed at these four major causes of acne, and should not be rushed and should be done gradually. One of the misconceptions about acne: Some people believe that acne is a symbol of youth and not a disease, and that it does not have any impact on life. In particular, the permanent scars caused by acne can cause psychological distress for future job hunting and friendships. Therefore, the attitude toward acne should be to treat it as early as possible. Myth #2 about acne: Food and acne have an important relationship. In recent years, large-scale medical studies in several countries have consistently shown that acne is not associated with food and beverages. Unless a patient confirms that acne is aggravated by a specific food, there is no need to “abstain” from eating. Third, some patients believe their skin is contaminated or deficient in nutrients. They blindly use hot water or alcohol or strong detergents to scrub their skin several times. This is counterproductive and will instead cause damage to the skin surface to speed up bacterial infections, thus aggravating the acne condition. A better way to wash your face is to use a low concentration of fruit acid or salicylic acid for 30-60 seconds, then wash your face with warm water 2-3 times. In addition, avoid applying oily skin care products to prevent clogging pores and aggravating acne. In conclusion, acne is a mixed physiological and pathological skin disease, and its pathogenesis and influencing factors have been clearly elucidated. There are now a variety of treatment options available at multiple levels. However, consultation with a specialist to identify the cause of acne and the correct treatment method is a guarantee of effective treatment.