Bactrim is mupirocin ointment. Both erythromycin and mupirocin can be used to treat coronary ulcers caused by bacterial infections (or a combination of bacterial infections). However, they have slightly different antibacterial spectrums, so the specific medication should be based on the type of bacteria being infected. Erythromycin belongs to macrolide antibiotics, which has a better inhibitory effect on most of the gram-positive bacteria on the surface of the skin (including staphylococcus, streptococcus pneumoniae, haemophilus influenzae, etc.), as well as atypical pathogens (such as mycoplasma, chlamydia, legionella, etc.); patients with the above bacterial infections can be treated with erythromycin ointment. The main ingredient of mupirocin ointment is mupirocin. Mupirocin has strong antibacterial activity against various Gram-positive cocci associated with skin infections, and is also effective against drug-resistant Staphylococcus aureus, and has some antibacterial effect against certain Gram-negative bacteria, and is suitable for various skin infections (especially Gram-positive infections). Patients with these bacterial infections can be treated with mupirocin. In addition, corns are usually localized skin ulcers caused by viral, bacterial and syphilitic spirochete infections. Noma caused by syphilis is the more common type of this disease, so patients with similar skin lesions need to go to the hospital in time, improve the relevant examination, and make a clear diagnosis. It is recommended that patients consult a doctor in a timely manner, under the guidance of a professional doctor to carry out the relevant examinations, to determine the cause of the disease, and then follow the doctor’s instructions to receive treatment. The medication should be used in accordance with the doctor’s instructions.