1. Possible triggers of acne: a) Excessive stress, sleeping too late, emotional anxiety. b) Intake of too much sugar, dairy products, starch, fried food, fat, spicy and heavy food. c)No good skin care habits, incomplete cleaning of the skin, clogged pores. Or over-cleaning, washing the face 3-5 times a day, causing lack of oil and water in the skin, instead inducing overproduction of sebaceous glands. d) Self-clearing acne with row of needles or squeezing acne, causing pore infection, dermal inflammation and scarring. e) Changes in endocrine secretion. Some women have increased acne before their periods, accompanied by dysmenorrhea, etc. They should check the sex hormone six, and polycystic ovary syndrome. 2, acne patients diet strategy: a) contraindicated foods: fatty, sweet and greasy, sweet drinks, fried food, fat, dairy products. b) Suitable foods: seafood (rich in polyunsaturated fatty acids, can reduce sebum secretion, anti-inflammatory), red vegetables (such as carrots and tomatoes, both should be cooked, otherwise not easily absorbed), high-fiber vegetables (such as celery, cabbage, etc.). 3. Acne skin care: a) Cleanse the skin carefully and use a facial wash containing scrubbing particles if necessary to reduce the clogging of follicular pores. It is not easy to wash your face more than 3 times. b) Acne skin is prone to acne and scarring under the action of UV rays, so be sure to pay attention to sun protection.