Azelaic acid cream is used for the topical treatment of mild to moderate inflammatory acne vulgaris. After washing and drying the skin, apply azelaic acid to the acne area in a thin layer twice a day, once in the morning and once in the evening, applying vigorously to ensure that it penetrates deeply into the skin and washing hands after application. Azelaic acid is a prescription drug, which must be prescribed by a doctor according to the condition of the drug, and follow the doctor’s instructions to use the drug, including usage, dosage, and time to use the drug. Do not self-medicate according to the instructions of the drug without authorization. If adverse reactions such as itching, burning, irritation and tingling sensation, erythema, etc. occur during the use of this product, it is recommended to stop the medication and go to the hospital in time. Care should be taken with azelaic acid: it is contraindicated in patients who are allergic to any of the ingredients in azelaic acid cream. Use with caution in children, pregnant and lactating women. Azelaic acid needs to be applied in full dosage, full course of treatment, do not easily reduce the dosage, stop the drug.