Acne after pregnancy, usually referred to as acne, is a chronic inflammatory skin disease of the sebaceous gland units of hair follicles. You can rub benzoyl peroxide, erythromycin ointment, azelaic acid and other ointments to treat it. 1. Benzoyl peroxide: after topical application, it can slowly release new ecological oxygen and benzoic acid, which has the effect of killing Propionibacterium acnes, dissolving acne and astringent. A small number of patients may experience mild skin irritation, so it is recommended to start with a low concentration and a small range of trial. 2. Erythromycin ointment: topical antibiotics such as erythromycin ointment can play a role in relieving acne inflammation. 3. Azelaic acid: inflammation and acne have therapeutic effects, but also can reduce post-inflammatory hyperpigmentation. Can be formulated into 15% to 20% cream for external use. The adverse reaction is mild local erythema and tingling. Acne after pregnancy is recommended to the hospital in a timely manner, in order to ensure the safety and effectiveness of the medication, be sure to use the medication under the guidance of a doctor.