A girl, a sophomore in high school. History: In the past 2 years, she has been suffering from heavy school work, frequent ulcers in her mouth, bad breath when she eats something hot (such as hot, barbecued or fried food), and red papules and pustules on her face, which have been rising and falling, and she has gone to a specialized hospital for acne treatment and has taken many medicines, but the effect is not good. On examination: 2 rice-sized ulcers on the palate, surrounded by redness, painful when eating, foul breath, short yellow urine and constipated stools. Examination: multiple red papules on the forehead, with pustules on some surfaces. Diagnosis: Acne. Identification: Heat accumulation in the stomach and intestines, fumigating the skin. Treatment: Clearing heat and resolving dampness. Remedy: Huang Lian Detoxification Tang with addition and subtraction. Prescription: Huang Lian 5g, Sheng Di 15g, Scutellaria baicalensis 10g, Loquat leaf 10g, Rhubarb 5g, Gardenia jasminoides 20g, Forsythia lanceolata 30g, Rhizoma alba 20g, Fishocephalae 20g. Take 1 dose daily with water decoction, local pustules treated with fire acupuncture. Efficacy: the above take 6 doses, the mouth sores cured, acne reduced; and then take 3 weeks, acne basically subside, bad breath, constipation disappeared, clinical cure. Experience: acne, mouth sores are mostly related to the stool. Chinese medicine believes that “the lung is the main skin”, “lung and large intestine,” constipation for a long time, the gastrointestinal heat, fire on the inflammation, smoked in the skin is acne, smoked in the mouth and tongue is stomatitis, performance is not the same, and the reasons are the same, so can be a party and solve.