[Papular acne] Begins as pimples, both whiteheads and blackheads, containing keratin and sebum. Whiteheads, also known as closed pimples, are skin-colored pimples the size of a pinhead, with inconspicuous follicle openings that make it difficult to squeeze out the sebum plugs. Blackhead acne, also known as open acne, the center of the pimple for the expansion of the pore, the sebum plug blocked in the follicle mouth, squeezed by hand, can be seen at the top of the black and the body of the yellow semi-transparent sebum plugs discharged, because of the top of the skin exposed to the surface of the sebum oxidation and the influence of dust, the formation of blackheads, and therefore called blackheads acne. In addition to sebum oxidation and keratin shedding debris, acne also contains multiple charred hairs. Causes of acne] Acne has several pathogenic factors. Endocrine factors, the role of sebum, and microorganisms in the hair follicle are the main factors in the development of acne. [Symptoms of Acne] Examine the pattern and distribution of lesions, the presence of papules, pustules, blackheads, nodules, cysts, and scarring. Acne treatment measures] 1, pay attention to regulating the function of the digestive tract, eat less animal fats, sweets and stimulating foods, to be often used in warm water, containing sulfur or other degreasing and anti-inflammatory soap to wash the affected area; 2, do not pick or squeeze acne, do not use oil cosmetics and corticosteroids; 3, prohibit bromine, iodine drugs; 4, explain to the patient that acne is the endocrine changes during puberty, mainly a common phenomenon due to changes in sex hormones. Treatment can reduce the lesions, but it is difficult to completely subside, and with the endocrine changes can be periodically aggravated or reduced.