Azelaic acid ointment is indicated for the treatment of mild to moderate inflammatory acne vulgaris, and is not recommended to be applied on broken pimples, which may aggravate local irritation. Azelaic acid ointment has antibacterial activity against Propionibacterium acnes and Staphylococcus epidermidis, can inhibit the formation of acne, can also reduce post-inflammatory hyperpigmentation, clinically can be applied topically for the treatment of mild and moderate inflammatory acne vulgaris. Adverse reactions such as localized itching, burning, stinging, dryness, and flaking may occur after the use of azelaic acid, and it is not recommended to be applied to broken acne, as it may aggravate local irritation. Azelaic acid should not be used in persons with a history of hypersensitivity to this drug. To use, the area should be cleaned and dried, and applied to the acne in a thin layer, taking care to rub it in carefully so that the medication is absorbed, and to wash hands after application. Azelaic acid ointment should be used under the supervision of a doctor, and a doctor should be consulted if there is any discomfort with its use.