Small blisters at the corners of the mouth should not be treated with erythromycin ointment in the absence of a concurrent bacterial infection.
Small blisters on the skin at the corners of the mouth are considered perioral herpes, which is a skin disease caused by infection with the herpes simplex virus, and requires the choice of antiviral medication in treatment, such as acyclovir ointment, penciclovir cream, and so on.
Erythromycin ointment is mainly composed of erythromycin, the drug belongs to the macrolide antibiotics, the main role is to anti-inflammatory, so it is commonly used in the treatment of a variety of bacterial infections, but not effective for viral infections.
Viral infections may induce bacterial infections due to the stimulation of some external factors, in which case erythromycin ointment can be chosen for anti-inflammatory treatment.
Before choosing antibiotic treatment, be sure to strictly follow the doctor’s instructions for medication.