Erythromycin ointment is an antibiotic external medicine. The main ingredients are erythromycin and base petroleum jelly. The main functions are anti-infection, anti-inflammatory and certain skin moisturizing effects. Because it causes little irritation and is a relatively safe topical drug, it has a wide range of uses. Clinically, it is mainly suitable for infections of skin and soft tissues, folliculitis, hidradenitis, sebaceous adenitis, and bacterial infections of the epidermis. And because it contains a certain base of petroleum jelly, it also has a certain alleviating effect on some dry skin diseases. For example, it also has a certain therapeutic effect on chronic eczema, or dryness and cracking caused by neurodermatitis.