Erythromycin ointment is a macrolide antibiotic that has antibacterial activity against most gram-positive bacteria, some gram-negative bacteria and some atypical pathogenic bacteria such as chlamydia and mycoplasma. It has a broad antibacterial spectrum and is usually used for purulent skin infections and penicillin-resistant staphylococcal infections. Erythromycin ointment occupies an important position in medical assistance. It is widely used in surgical operations, wound healing, and skin ulceration, and the effect is obvious. But medicines are toxic, so how to avoid side effects? It can also be used for purulent skin diseases such as impetigo, small area burns, ulcer surface infections and acne vulgaris. It also plays a certain role in skin care. Erythromycin ointment is an over-the-counter drug that is sold in major pharmacies and has relatively few side effects. Contraindications for the use of erythromycin ointment: 1. It has antagonistic effects with chloramphenicol and lincomycin, so combined use should be avoided. 2. Drug interactions may occur if used together with other drugs. Please consult a physician or pharmacist for details. 3. It is forbidden for those who are allergic to erythromycin.